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Solution
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Q.1 Correct
Q.1 In-correct
Q.1 Unattempt

A double slit interference experiment performed with a light of wavelength 600 nm forms an interference fringe pattern on a screen with 10 th bright fringe having its centre at a distance of 10 mm from the central maximum. Distance of the centre of the same 10 th bright fringe from the central maximum when the source of light is replaced by another source of wavelength 660 nm would be ________ mm .



JEE Main 2025 (Online) 28th January Morning Shift

A double slit interference experiment performed with a light of wavelength 600 nm forms an interference fringe pattern on a screen with 10 th bright fringe having its centre at a distance of 10 mm from the central maximum. Distance of the centre of the same 10 th bright fringe from the central maximum when the source of light is replaced by another source of wavelength 660 nm would be ________ mm .



JEE Main 2025 (Online) 28th January Morning Shift
Q.2 Correct
Q.2 In-correct
Q.2 Unattempt
A thin transparent film with refractive index 1.4 , is held on circular ring of radius 1.8 cm . The fluid in the film evaporates such that transmission through the film at wavelength 560 nm goes to a minimum every 12 seconds. Assuming that the film is flat on its two sides, the rate of evaporation is ____________ $\pi\times 10^{-13} \mathrm{~m}^3 / \mathrm{s}$.

JEE Main 2025 (Online) 28th January Evening Shift
A thin transparent film with refractive index 1.4 , is held on circular ring of radius 1.8 cm . The fluid in the film evaporates such that transmission through the film at wavelength 560 nm goes to a minimum every 12 seconds. Assuming that the film is flat on its two sides, the rate of evaporation is ____________ $\pi\times 10^{-13} \mathrm{~m}^3 / \mathrm{s}$.

JEE Main 2025 (Online) 28th January Evening Shift
Q.3 Correct
Q.3 In-correct
Q.3 Unattempt

If the measured angular separation between the second minimum to the left of the central maximum and the third minimum to the right of the central maximum is $30^{\circ}$ in a single slit diffraction pattern recorded using 628 nm light, then the width of the slit is _______ $\mu$m.



JEE Main 2025 (Online) 2nd April Morning Shift

If the measured angular separation between the second minimum to the left of the central maximum and the third minimum to the right of the central maximum is $30^{\circ}$ in a single slit diffraction pattern recorded using 628 nm light, then the width of the slit is _______ $\mu$m.



JEE Main 2025 (Online) 2nd April Morning Shift
Q.4 Correct
Q.4 In-correct
Q.4 Unattempt
Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. The difference between the maximum and minimum intensities in the resulting interference pattern is $x \mathrm{I}$. The value of $x$ is___________ .

JEE Main 2025 (Online) 3rd April Morning Shift
Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. The difference between the maximum and minimum intensities in the resulting interference pattern is $x \mathrm{I}$. The value of $x$ is___________ .

JEE Main 2025 (Online) 3rd April Morning Shift
Q.5 Correct
Q.5 In-correct
Q.5 Unattempt

In a Young's double slit experiment, two slits are located 1.5 mm apart. The distance of screen from slits is 2 m and the wavelength of the source is 400 nm . If the 20 maxima of the double slit pattern are contained within the central maximum of the single slit diffraction pattern, then the width of each slit is $x \times 10^{-3} \mathrm{~cm}$, where $x$-value is _________ .



JEE Main 2025 (Online) 4th April Evening Shift

In a Young's double slit experiment, two slits are located 1.5 mm apart. The distance of screen from slits is 2 m and the wavelength of the source is 400 nm . If the 20 maxima of the double slit pattern are contained within the central maximum of the single slit diffraction pattern, then the width of each slit is $x \times 10^{-3} \mathrm{~cm}$, where $x$-value is _________ .



JEE Main 2025 (Online) 4th April Evening Shift
Q.6 Correct
Q.6 In-correct
Q.6 Unattempt

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion-(A) : If Young's double slit experiment is performed in an optically denser medium than air, then the consecutive fringes come closer.

Reason-(R) : The speed of light reduces in an optically denser medium than air while its frequency does not change.

In the light of the above statements, choose the most appropriate answer from the options given below :



JEE Main 2025 (Online) 22nd January Morning Shift

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion-(A) : If Young's double slit experiment is performed in an optically denser medium than air, then the consecutive fringes come closer.

Reason-(R) : The speed of light reduces in an optically denser medium than air while its frequency does not change.

In the light of the above statements, choose the most appropriate answer from the options given below :



JEE Main 2025 (Online) 22nd January Morning Shift
Q.7 Correct
Q.7 In-correct
Q.7 Unattempt

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In Young's double slit experiment, the fringes produced by red light are closer as compared to those produced by blue light.

Reason (R) : The fringe width is directly proportional to the wavelength of light.

In the light of the above statements, choose the correct answer from the options given below :



JEE Main 2025 (Online) 22nd January Evening Shift

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : In Young's double slit experiment, the fringes produced by red light are closer as compared to those produced by blue light.

Reason (R) : The fringe width is directly proportional to the wavelength of light.

In the light of the above statements, choose the correct answer from the options given below :



JEE Main 2025 (Online) 22nd January Evening Shift
Q.8 Correct
Q.8 In-correct
Q.8 Unattempt

A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45. What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm . [Assume that the light is incident nearly perpendicular to the glass surface.]



JEE Main 2025 (Online) 22nd January Evening Shift

A transparent film of refractive index, 2.0 is coated on a glass slab of refractive index, 1.45. What is the minimum thickness of transparent film to be coated for the maximum transmission of Green light of wavelength 550 nm . [Assume that the light is incident nearly perpendicular to the glass surface.]



JEE Main 2025 (Online) 22nd January Evening Shift
Q.9 Correct
Q.9 In-correct
Q.9 Unattempt

The width of one of the two slits in Young's double slit experiment is d while that of the other slit is $x \mathrm{~d}$. If the ratio of the maximum to the minimum intensity in the interference pattern on the screen is $9: 4$ then what is the value of $x$ ?(Assume that the field strength varies according to the slit width.)



JEE Main 2025 (Online) 23rd January Evening Shift

The width of one of the two slits in Young's double slit experiment is d while that of the other slit is $x \mathrm{~d}$. If the ratio of the maximum to the minimum intensity in the interference pattern on the screen is $9: 4$ then what is the value of $x$ ?(Assume that the field strength varies according to the slit width.)



JEE Main 2025 (Online) 23rd January Evening Shift
Q.10 Correct
Q.10 In-correct
Q.10 Unattempt

The Young's double slit interference experiment is performed using light consisting of 480 nm and 600 nm wavelengths to form interference patterns. The least number of the bright fringes of 480 nm light that are required for the first coincidence with the bright fringes formed by 600 nm light is



JEE Main 2025 (Online) 24th January Morning Shift

The Young's double slit interference experiment is performed using light consisting of 480 nm and 600 nm wavelengths to form interference patterns. The least number of the bright fringes of 480 nm light that are required for the first coincidence with the bright fringes formed by 600 nm light is



JEE Main 2025 (Online) 24th January Morning Shift
Q.11 Correct
Q.11 In-correct
Q.11 Unattempt

Young's double slit inteference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm . The fringe-width on a screen placed behind the plane of slits at a distance of 0.72 m , will be:



JEE Main 2025 (Online) 24th January Evening Shift

Young's double slit inteference apparatus is immersed in a liquid of refractive index 1.44. It has slit separation of 1.5 mm . The slits are illuminated by a parallel beam of light whose wavelength in air is 690 nm . The fringe-width on a screen placed behind the plane of slits at a distance of 0.72 m , will be:



JEE Main 2025 (Online) 24th January Evening Shift
Q.12 Correct
Q.12 In-correct
Q.12 Unattempt

In a Young's double slit experiment, three polarizers are kept as shown in the figure. The transmission axes of $P_1$ and $P_2$ are orthogonal to each other. The polarizer $P_3$ covers both the slits with its transmission axis at $45^{\circ}$ to those of $P_1$ and $P_2$. An unpolarized light of wavelength $\lambda$ and intensity $I_0$ is incident on $P_1$ and $P_2$. The intensity at a point after $P_3$ where the path difference between the light waves from $s_1$ and $s_2$ is $\frac{\lambda}{3}$, is

JEE Main 2025 (Online) 24th January Evening Shift Physics - Wave Optics Question 13 English



JEE Main 2025 (Online) 24th January Evening Shift

In a Young's double slit experiment, three polarizers are kept as shown in the figure. The transmission axes of $P_1$ and $P_2$ are orthogonal to each other. The polarizer $P_3$ covers both the slits with its transmission axis at $45^{\circ}$ to those of $P_1$ and $P_2$. An unpolarized light of wavelength $\lambda$ and intensity $I_0$ is incident on $P_1$ and $P_2$. The intensity at a point after $P_3$ where the path difference between the light waves from $s_1$ and $s_2$ is $\frac{\lambda}{3}$, is

JEE Main 2025 (Online) 24th January Evening Shift Physics - Wave Optics Question 13 English



JEE Main 2025 (Online) 24th January Evening Shift
Q.13 Correct
Q.13 In-correct
Q.13 Unattempt
At the interface between two materials having refractive indices $n_1$ and $n_2$, the critical angle for reflection of an em wave is $\theta_{1C}$. The $\mathrm{n}_2$ material is replaced by another material having refractive index $n_3$ such that the critical angle at the interface between $n_1$ and $n_3$ materials is $\theta_{2 C}$. If $n_3>n_2>n_1 ; \frac{n_2}{n_3}=\frac{2}{5}$ and $\sin \theta_{2 C}-\sin \theta_{1 C}=\frac{1}{2}$, then $\theta_{1 C}$ is :

JEE Main 2025 (Online) 29th January Morning Shift
At the interface between two materials having refractive indices $n_1$ and $n_2$, the critical angle for reflection of an em wave is $\theta_{1C}$. The $\mathrm{n}_2$ material is replaced by another material having refractive index $n_3$ such that the critical angle at the interface between $n_1$ and $n_3$ materials is $\theta_{2 C}$. If $n_3>n_2>n_1 ; \frac{n_2}{n_3}=\frac{2}{5}$ and $\sin \theta_{2 C}-\sin \theta_{1 C}=\frac{1}{2}$, then $\theta_{1 C}$ is :

JEE Main 2025 (Online) 29th January Morning Shift
Q.14 Correct
Q.14 In-correct
Q.14 Unattempt

A light wave is propagating with plane wave fronts of the type $x+y+z=$ constant. Th angle made by the direction of wave propagation with the $x$-axis is :



JEE Main 2025 (Online) 2nd April Morning Shift

A light wave is propagating with plane wave fronts of the type $x+y+z=$ constant. Th angle made by the direction of wave propagation with the $x$-axis is :



JEE Main 2025 (Online) 2nd April Morning Shift
Q.15 Correct
Q.15 In-correct
Q.15 Unattempt

A monochromatic light of frequency $5 \times 10^{14} \mathrm{~Hz}$ travelling through air, is incident on a medium of refractive index ' 2 '. Wavelength of the refracted light will be :



JEE Main 2025 (Online) 3rd April Evening Shift

A monochromatic light of frequency $5 \times 10^{14} \mathrm{~Hz}$ travelling through air, is incident on a medium of refractive index ' 2 '. Wavelength of the refracted light will be :



JEE Main 2025 (Online) 3rd April Evening Shift
Q.16 Correct
Q.16 In-correct
Q.16 Unattempt

Width of one of the two slits in a Young's double slit interference experiment is half of the other slit. The ratio of the maximum to the minimum intensity in the interference pattern is :



JEE Main 2025 (Online) 3rd April Evening Shift

Width of one of the two slits in a Young's double slit interference experiment is half of the other slit. The ratio of the maximum to the minimum intensity in the interference pattern is :



JEE Main 2025 (Online) 3rd April Evening Shift
Q.17 Correct
Q.17 In-correct
Q.17 Unattempt
Two monochromatic light beams have intensities in the ratio 1:9. An interference pattern is obtained by these beams. The ratio of the intensities of maximum to minimum is

JEE Main 2025 (Online) 3rd April Evening Shift
Two monochromatic light beams have intensities in the ratio 1:9. An interference pattern is obtained by these beams. The ratio of the intensities of maximum to minimum is

JEE Main 2025 (Online) 3rd April Evening Shift
Q.18 Correct
Q.18 In-correct
Q.18 Unattempt

In a Young's double slit experiment, the slits are separated by 0.2 mm . If the slits separation is increased to 0.4 mm , the percentage change of the fringe width is :



JEE Main 2025 (Online) 4th April Morning Shift

In a Young's double slit experiment, the slits are separated by 0.2 mm . If the slits separation is increased to 0.4 mm , the percentage change of the fringe width is :



JEE Main 2025 (Online) 4th April Morning Shift
Q.19 Correct
Q.19 In-correct
Q.19 Unattempt

Two polarisers $P_1$ and $P_2$ are placed in such a way that the intensity of the transmitted light will be zero. A third polariser $P_3$ is inserted in between $P_1$ and $P_2$, at particular angle between $P_2$ and $P_3$. The transmitted intensity of the light passing the through all three polarisers is maximum. The angle between the polarisers $P_2$ and $P_3$ is :



JEE Main 2025 (Online) 4th April Evening Shift

Two polarisers $P_1$ and $P_2$ are placed in such a way that the intensity of the transmitted light will be zero. A third polariser $P_3$ is inserted in between $P_1$ and $P_2$, at particular angle between $P_2$ and $P_3$. The transmitted intensity of the light passing the through all three polarisers is maximum. The angle between the polarisers $P_2$ and $P_3$ is :



JEE Main 2025 (Online) 4th April Evening Shift
Q.20 Correct
Q.20 In-correct
Q.20 Unattempt

Two plane polarized light waves combine at a certain point whose electric field components are

$$\begin{aligned}& E_1=E_0 \operatorname{Sin} \omega t \\& E_2=E_0 \operatorname{Sin}\left(\omega t+\frac{\pi}{3}\right)\end{aligned}$$

Find the amplitude of the resultant wave.



JEE Main 2025 (Online) 7th April Morning Shift

Two plane polarized light waves combine at a certain point whose electric field components are

$$\begin{aligned}& E_1=E_0 \operatorname{Sin} \omega t \\& E_2=E_0 \operatorname{Sin}\left(\omega t+\frac{\pi}{3}\right)\end{aligned}$$

Find the amplitude of the resultant wave.



JEE Main 2025 (Online) 7th April Morning Shift
Q.21 Correct
Q.21 In-correct
Q.21 Unattempt

In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case:



JEE Main 2025 (Online) 8th April Evening Shift

In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and another by a green filter. In this case:



JEE Main 2025 (Online) 8th April Evening Shift
Q.22 Correct
Q.22 In-correct
Q.22 Unattempt
When a polaroid sheet is rotated between two crossed polaroids then the transmitted light intensity will be maximum for a rotation of :
[27-Jan-2024 Shift 2]
When a polaroid sheet is rotated between two crossed polaroids then the transmitted light intensity will be maximum for a rotation of :
[27-Jan-2024 Shift 2]
Q.23 Correct
Q.23 In-correct
Q.23 Unattempt
A parallel beam of monochromatic light of wavelength 5000Å is incident normally on a single narrow slit of width 0.001‌mm. The light is focused by convex lens on screen, placed on its focal plane. The first minima will be formed for the angle of diffraction of ____(degree).
[27-Jan-2024 Shift 2]
A parallel beam of monochromatic light of wavelength 5000Å is incident normally on a single narrow slit of width 0.001‌mm. The light is focused by convex lens on screen, placed on its focal plane. The first minima will be formed for the angle of diffraction of ____(degree).
[27-Jan-2024 Shift 2]
Q.24 Correct
Q.24 In-correct
Q.24 Unattempt
In a double slit experiment shown in figure, when light of wavelength 400‌nm is used, dark fringe is observed at P. If D=0.2m. the minimum distance between the slits S1 and S2 is_____ mm.

[29-Jan-2024 Shift 1]
In a double slit experiment shown in figure, when light of wavelength 400‌nm is used, dark fringe is observed at P. If D=0.2m. the minimum distance between the slits S1 and S2 is_____ mm.

[29-Jan-2024 Shift 1]
Q.25 Correct
Q.25 In-correct
Q.25 Unattempt
In Young's double slit experiment, light from two identical sources are superimposing on a screen. The path difference between the two lights reaching at a point on the screen is ‌
7λ
4
. The ratio of intensity of fringe at this point with respect to the maximum intensity of the fringe is :
[29-Jan-2024 Shift 2]
In Young's double slit experiment, light from two identical sources are superimposing on a screen. The path difference between the two lights reaching at a point on the screen is ‌
7λ
4
. The ratio of intensity of fringe at this point with respect to the maximum intensity of the fringe is :
[29-Jan-2024 Shift 2]
Q.26 Correct
Q.26 In-correct
Q.26 Unattempt
In a single slit diffraction pattern, a light of wavelength 6000Å is used. The distance between the first and third minima in the diffraction pattern is found to be 3‌mm when the screen in placed 50 cm away from slits. The width of the slit is ×10−4m
[29-Jan-2024 Shift 2]
In a single slit diffraction pattern, a light of wavelength 6000Å is used. The distance between the first and third minima in the diffraction pattern is found to be 3‌mm when the screen in placed 50 cm away from slits. The width of the slit is ×10−4m
[29-Jan-2024 Shift 2]
Q.27 Correct
Q.27 In-correct
Q.27 Unattempt
The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2‌mm is focused on the focal plane of a convex lens of focal length 100‌cm. The width of the 1‌st ‌ secondary maxima will be :
[30-Jan-2024 Shift 1]
The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2‌mm is focused on the focal plane of a convex lens of focal length 100‌cm. The width of the 1‌st ‌ secondary maxima will be :
[30-Jan-2024 Shift 1]
Q.28 Correct
Q.28 In-correct
Q.28 Unattempt
A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45∘ relative to that of A. The intensity of emergent light is :
[30-Jan-2024 Shift 2]
A beam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45∘ relative to that of A. The intensity of emergent light is :
[30-Jan-2024 Shift 2]
Q.29 Correct
Q.29 In-correct
Q.29 Unattempt
Two waves of intensity ratio 1:9 cross each other at a point. The resultant intensities at the point, when (a) Waves are incoherent is I1(b) Waves are coherent is I2 and differ in phase by 60∘. If ‌
11
12
=‌
10
x
 then x=____
[31-Jan-2024 Shift 1]
Two waves of intensity ratio 1:9 cross each other at a point. The resultant intensities at the point, when (a) Waves are incoherent is I1(b) Waves are coherent is I2 and differ in phase by 60∘. If ‌
11
12
=‌
10
x
 then x=____
[31-Jan-2024 Shift 1]
Q.30 Correct
Q.30 In-correct
Q.30 Unattempt
When unpolarized light is incident at an angle of 60∘ on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is
[31-Jan-2024 Shift 2]
When unpolarized light is incident at an angle of 60∘ on a transparent medium from air. The reflected ray is completely polarized. The angle of refraction in the medium is
[31-Jan-2024 Shift 2]
Q.31 Correct
Q.31 In-correct
Q.31 Unattempt
A monochromatic light of wavelength 6000Å is incident on the single slit of width 0.01‌mm. If the diffraction pattern is formed at the focus of the convex lens of focal length 20‌cm, the linear width of the central maximum is :
[1-Feb-2024 Shift 1]
A monochromatic light of wavelength 6000Å is incident on the single slit of width 0.01‌mm. If the diffraction pattern is formed at the focus of the convex lens of focal length 20‌cm, the linear width of the central maximum is :
[1-Feb-2024 Shift 1]
Q.32 Correct
Q.32 In-correct
Q.32 Unattempt
A microwave of wavelength 2.0‌cm falls normally on a slit of width 4.0‌cm. The angular spread of the central maxima of the diffraction pattern obtained on a screen 1.5m away from the slit, will be:
[1-Feb-2024 Shift 2]
A microwave of wavelength 2.0‌cm falls normally on a slit of width 4.0‌cm. The angular spread of the central maxima of the diffraction pattern obtained on a screen 1.5m away from the slit, will be:
[1-Feb-2024 Shift 2]
Q.33 Correct
Q.33 In-correct
Q.33 Unattempt
In Young's double slit experiment, monochromatic light of wavelength 5000Å is used. The slits are 1.0‌mm apart and screen is placed at 1.0m away from slits. The distance from the centre of the screen where intensity becomes half of the maximum intensity for the first time is____ ‌‌×10−6m.
[1-Feb-2024 Shift 2]
In Young's double slit experiment, monochromatic light of wavelength 5000Å is used. The slits are 1.0‌mm apart and screen is placed at 1.0m away from slits. The distance from the centre of the screen where intensity becomes half of the maximum intensity for the first time is____ ‌‌×10−6m.
[1-Feb-2024 Shift 2]
Q.34 Correct
Q.34 In-correct
Q.34 Unattempt
Given below are two statements :
Statement I : If the Brewster's angle for the light propagating from air to glass is θB, then Brewster's angle for the light propagating from glass to air is ‌
π
2
−θB.
Statement II : The Brewster's angle for the light propagating from glass to air is tan−1(µg) where µg is the refractive index of glass.
In the light of the above statements, choose the correct answer from the options given below :
[24-Jan-2023 Shift 1]
Given below are two statements :
Statement I : If the Brewster's angle for the light propagating from air to glass is θB, then Brewster's angle for the light propagating from glass to air is ‌
π
2
−θB.
Statement II : The Brewster's angle for the light propagating from glass to air is tan−1(µg) where µg is the refractive index of glass.
In the light of the above statements, choose the correct answer from the options given below :
[24-Jan-2023 Shift 1]
Q.35 Correct
Q.35 In-correct
Q.35 Unattempt
In Young's double slits experiment, the position of 5‌th ‌ bright fringe from the central maximum is 5‌cm. The distance between slits and screen is 1m and wavelength of used monochromatic light is 600‌nm. The separation between the slits is:
[25-Jan-2023 Shift 1]
In Young's double slits experiment, the position of 5‌th ‌ bright fringe from the central maximum is 5‌cm. The distance between slits and screen is 1m and wavelength of used monochromatic light is 600‌nm. The separation between the slits is:
[25-Jan-2023 Shift 1]
Q.36 Correct
Q.36 In-correct
Q.36 Unattempt
In a Young's double slit experiment, two slits are illuminated with a light of wavelength 800‌nm. The line joining A1P is perpendicular to A1A2 as shown in the figure. If the first minimum is detected at P, the value of slits separation ' a ' will be :
The distance of screen from slits D=5‌cm

[29-Jan-2023 Shift 1]
In a Young's double slit experiment, two slits are illuminated with a light of wavelength 800‌nm. The line joining A1P is perpendicular to A1A2 as shown in the figure. If the first minimum is detected at P, the value of slits separation ' a ' will be :
The distance of screen from slits D=5‌cm

[29-Jan-2023 Shift 1]
Q.37 Correct
Q.37 In-correct
Q.37 Unattempt
As shown in figures, three identical polaroids P1, P2 and P3 are placed one after another. The pass axis of P2 and P3 are inclined at angle of 60∘ and 90∘ with respect to axis of P1. The source S has an intensity of 256‌
W
m2
. The intensity of light at point O is −−−−−‌
W
m2
.

[29-Jan-2023 Shift 1]
As shown in figures, three identical polaroids P1, P2 and P3 are placed one after another. The pass axis of P2 and P3 are inclined at angle of 60∘ and 90∘ with respect to axis of P1. The source S has an intensity of 256‌
W
m2
. The intensity of light at point O is −−−−−‌
W
m2
.

[29-Jan-2023 Shift 1]
Q.38 Correct
Q.38 In-correct
Q.38 Unattempt
Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium -1) and 6.8 (medium 2 ), respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be tan−1(1+‌
10
θ
)‌
1
2
 the value of θ is ______.
(Given for dielectric media, µr=1 )
[29-Jan-2023 Shift 2]
Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium -1) and 6.8 (medium 2 ), respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be tan−1(1+‌
10
θ
)‌
1
2
 the value of θ is ______.
(Given for dielectric media, µr=1 )
[29-Jan-2023 Shift 2]
Q.39 Correct
Q.39 In-correct
Q.39 Unattempt
In Young's double slit experiment, two slits S1 and S2 are ' d ' distance apart and the separation from slits to screen is D (as shown in figure). Now if two transparent slabs of equal thickness 0.1‌mm but refractive index 1.51 and 1.55 are introduced in the path of beam (λ=4000Å) from S1 and S2 respectively. The central bright fringe spot will shift by _______ number of fringes.

[30-Jan-2023 Shift 1]
In Young's double slit experiment, two slits S1 and S2 are ' d ' distance apart and the separation from slits to screen is D (as shown in figure). Now if two transparent slabs of equal thickness 0.1‌mm but refractive index 1.51 and 1.55 are introduced in the path of beam (λ=4000Å) from S1 and S2 respectively. The central bright fringe spot will shift by _______ number of fringes.

[30-Jan-2023 Shift 1]
Q.40 Correct
Q.40 In-correct
Q.40 Unattempt
In a Young's double slit experiment, the intensities at two points, for the path difference ‌
λ
4
 and ‌
λ
3
 ( λ being the wavelength of light used) are I1 and I2 respectively. If I0 denotes the intensity produced by each one of the individual slits, then ‌
I1+I2
I0
=......
[30-Jan-2023 Shift 2]
In a Young's double slit experiment, the intensities at two points, for the path difference ‌
λ
4
 and ‌
λ
3
 ( λ being the wavelength of light used) are I1 and I2 respectively. If I0 denotes the intensity produced by each one of the individual slits, then ‌
I1+I2
I0
=......
[30-Jan-2023 Shift 2]
Q.41 Correct
Q.41 In-correct
Q.41 Unattempt
Two polaroide A and B are placed in such a way that the pass-axis of polaroids are perpendicular to each other. Now, another polaroid C is placed between A and B bisecting angle between them. If intensity of unpolarised light is I0 then intensity of transmitted light after passing through polaroid B will be :
[31-Jan-2023 Shift 1]
Two polaroide A and B are placed in such a way that the pass-axis of polaroids are perpendicular to each other. Now, another polaroid C is placed between A and B bisecting angle between them. If intensity of unpolarised light is I0 then intensity of transmitted light after passing through polaroid B will be :
[31-Jan-2023 Shift 1]
Q.42 Correct
Q.42 In-correct
Q.42 Unattempt
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The beam of electrons shows wave nature and exhibit interference and diffraction.
Reason R : Davisson Germer Experimentally verified the wave nature of electrons.
In the light of the above statements. Choose the most appropriate answer from the options given below :
[31-Jan-2023 Shift 1]
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R
Assertion A: The beam of electrons shows wave nature and exhibit interference and diffraction.
Reason R : Davisson Germer Experimentally verified the wave nature of electrons.
In the light of the above statements. Choose the most appropriate answer from the options given below :
[31-Jan-2023 Shift 1]
Q.43 Correct
Q.43 In-correct
Q.43 Unattempt
Two light waves of wavelengths 800 and 600‌nm are used in Young's double slit experiment to obtain interference fringes on a screen placed 7m away from plane of slits. If the two slits are separated by 0.35‌mm, then shortest distance from the central bright maximum to the point where the bright fringes of the two wavelength coincide will be _______ mm.
[31-Jan-2023 Shift 2]
Two light waves of wavelengths 800 and 600‌nm are used in Young's double slit experiment to obtain interference fringes on a screen placed 7m away from plane of slits. If the two slits are separated by 0.35‌mm, then shortest distance from the central bright maximum to the point where the bright fringes of the two wavelength coincide will be _______ mm.
[31-Jan-2023 Shift 2]
Q.44 Correct
Q.44 In-correct
Q.44 Unattempt
' n ' polarizing sheets are arranged such that each makes an angle 45∘ with the proceeding sheet. An unpolarized light of intensity I is incident into this arrangement. The output intensity is found to be ‌
I
64
. The value of n will be:
[1-Feb-2023 Shift 1]
' n ' polarizing sheets are arranged such that each makes an angle 45∘ with the proceeding sheet. An unpolarized light of intensity I is incident into this arrangement. The output intensity is found to be ‌
I
64
. The value of n will be:
[1-Feb-2023 Shift 1]
Q.45 Correct
Q.45 In-correct
Q.45 Unattempt
As shown in the figure, in Young's double slit experiment, a thin plate of thickness t=10µm and refractive index µ=1.2 is inserted infront of slit S1. The experiment is conducted in air (µ=1) and uses a monochromatic light of wavelength λ=500‌nm. Due to the insertion of the plate, central maxima is shifted by a distance of xβ0. β0 is the fringe-width before the insertion of the plate. The value of the x is ______.

[1-Feb-2023 Shift 2]
As shown in the figure, in Young's double slit experiment, a thin plate of thickness t=10µm and refractive index µ=1.2 is inserted infront of slit S1. The experiment is conducted in air (µ=1) and uses a monochromatic light of wavelength λ=500‌nm. Due to the insertion of the plate, central maxima is shifted by a distance of xβ0. β0 is the fringe-width before the insertion of the plate. The value of the x is ______.

[1-Feb-2023 Shift 2]
Q.46 Correct
Q.46 In-correct
Q.46 Unattempt
A beam of light consisting of two wavelengths 7000Å and 5500Å is used to obtain interference pattern in Young's double slit experiment. The distance between the slits is 2.5‌mm and the distance between the place of slits and the screen is 150‌cm. The least distance from the central fringe, where the bright fringes due to both the wavelengths coincide, is n×10−5m. The value of n is ________
[6-Apr-2023 shift 2]
A beam of light consisting of two wavelengths 7000Å and 5500Å is used to obtain interference pattern in Young's double slit experiment. The distance between the slits is 2.5‌mm and the distance between the place of slits and the screen is 150‌cm. The least distance from the central fringe, where the bright fringes due to both the wavelengths coincide, is n×10−5m. The value of n is ________
[6-Apr-2023 shift 2]
Q.47 Correct
Q.47 In-correct
Q.47 Unattempt
The width of fringe is 2‌mm on the screen in a double slits experiment for the light of wavelength of 400‌nm. The width of the fringe for the light of wavelength 600‌nm will be:
[8-Apr-2023 shift 2]
The width of fringe is 2‌mm on the screen in a double slits experiment for the light of wavelength of 400‌nm. The width of the fringe for the light of wavelength 600‌nm will be:
[8-Apr-2023 shift 2]
Q.48 Correct
Q.48 In-correct
Q.48 Unattempt
Unpolarised light of intensity 32Wm−2 passes through the combination of three polaroids such that the pass axis of the last polaroid is perpendicular to that of the pass axis of first polaroid. If intensity of emerging light is 3 Wm−2, then the angle between pass axis of first two polaroids is ________.
[10-Apr-2023 shift 1]
Unpolarised light of intensity 32Wm−2 passes through the combination of three polaroids such that the pass axis of the last polaroid is perpendicular to that of the pass axis of first polaroid. If intensity of emerging light is 3 Wm−2, then the angle between pass axis of first two polaroids is ________.
[10-Apr-2023 shift 1]
Q.49 Correct
Q.49 In-correct
Q.49 Unattempt
The ratio of intensities at two points P and Q on the screen in a Young's double slit experiment where phase difference between two waves of same amplitude are π∕3 and π∕2, respectively are
[10-Apr-2023 shift 2]
The ratio of intensities at two points P and Q on the screen in a Young's double slit experiment where phase difference between two waves of same amplitude are π∕3 and π∕2, respectively are
[10-Apr-2023 shift 2]
Q.50 Correct
Q.50 In-correct
Q.50 Unattempt
In a Young's double slits experiment, the ratio of amplitude of light coming from slits is 2:1. The ratio of the maximum to minimum intensity in the interference pattern is :
[13-Apr-2023 shift 2]
In a Young's double slits experiment, the ratio of amplitude of light coming from slits is 2:1. The ratio of the maximum to minimum intensity in the interference pattern is :
[13-Apr-2023 shift 2]
Q.51 Correct
Q.51 In-correct
Q.51 Unattempt
A single slit of width a is illuminated by a monochromatic light of wavelength 600‌nm. The value of 'a' for which first minimum appears at θ=30∘ on the screen will be :
[15-Apr-2023 shift 1]
A single slit of width a is illuminated by a monochromatic light of wavelength 600‌nm. The value of 'a' for which first minimum appears at θ=30∘ on the screen will be :
[15-Apr-2023 shift 1]
Q.52 Correct
Q.52 In-correct
Q.52 Unattempt
Sodium light of wavelengths 650‌nm and 655‌nm is used to study diffraction at a single slit of aperture 0.5‌mm. The distance between the slit and the screen is 2.0m. The separation between the positions of the first maxima of diffraction pattern obtained in the two cases is ______×10−5 m.
[24-Jun-2022-Shift-1]
Sodium light of wavelengths 650‌nm and 655‌nm is used to study diffraction at a single slit of aperture 0.5‌mm. The distance between the slit and the screen is 2.0m. The separation between the positions of the first maxima of diffraction pattern obtained in the two cases is ______×10−5 m.
[24-Jun-2022-Shift-1]
Q.53 Correct
Q.53 In-correct
Q.53 Unattempt
The two light beams having intensities I and 91 interfere to produce a fringe pattern on a screen. The phase difference between the beams is π∕2 at point P and π at point Q. Then the difference between the resultant intensities at P and Q will be :
[25-Jun-2022-Shift-1]
The two light beams having intensities I and 91 interfere to produce a fringe pattern on a screen. The phase difference between the beams is π∕2 at point P and π at point Q. Then the difference between the resultant intensities at P and Q will be :
[25-Jun-2022-Shift-1]
Q.54 Correct
Q.54 In-correct
Q.54 Unattempt
The interference pattern is obtained with two coherent light sources of intensity ratio 4:1. And the ratio ‌
Imax+Imin
Imax−Imin
 is ‌
5
x
. Then, the value of x will be equal to :
[25-Jun-2022-Shift-2]
The interference pattern is obtained with two coherent light sources of intensity ratio 4:1. And the ratio ‌
Imax+Imin
Imax−Imin
 is ‌
5
x
. Then, the value of x will be equal to :
[25-Jun-2022-Shift-2]
Q.55 Correct
Q.55 In-correct
Q.55 Unattempt
In free space, an electromagnetic wave of 3‌GHz frequency strikes over the edge of an object of size ‌
λ
100
, where λ is the wavelength of the wave in free space. The phenomenon, which happens there will be :
[26-Jun-2022-Shift-1]
In free space, an electromagnetic wave of 3‌GHz frequency strikes over the edge of an object of size ‌
λ
100
, where λ is the wavelength of the wave in free space. The phenomenon, which happens there will be :
[26-Jun-2022-Shift-1]
Q.56 Correct
Q.56 In-correct
Q.56 Unattempt
For a specific wavelength 670‌nm of light coming from a galaxy moving with velocity v, the observed wavelength is 670.7‌nm. The value of v is :
[26-Jun-2022-Shift-2]
For a specific wavelength 670‌nm of light coming from a galaxy moving with velocity v, the observed wavelength is 670.7‌nm. The value of v is :
[26-Jun-2022-Shift-2]
Q.57 Correct
Q.57 In-correct
Q.57 Unattempt
In Young's double slit experiment the two slits are 0.6‌mm distance apart. Interference pattern is observed on a screen at a distance 80‌cm from the slits. The first dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light will be____ nm.
[27-Jun-2022-Shift-1]
In Young's double slit experiment the two slits are 0.6‌mm distance apart. Interference pattern is observed on a screen at a distance 80‌cm from the slits. The first dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light will be____ nm.
[27-Jun-2022-Shift-1]
Q.58 Correct
Q.58 In-correct
Q.58 Unattempt
In Young's double slit experiment performed using a monochromatic light of wavelength λ, when a glass plate ( µ=1.5) of thickness xλ is introduced in the path of the one of the interfering beams, the intensity at the position where the central maximum occurred previously remains unchanged. The value of x will be :
[28-Jun-2022-Shift-2]
In Young's double slit experiment performed using a monochromatic light of wavelength λ, when a glass plate ( µ=1.5) of thickness xλ is introduced in the path of the one of the interfering beams, the intensity at the position where the central maximum occurred previously remains unchanged. The value of x will be :
[28-Jun-2022-Shift-2]
Q.59 Correct
Q.59 In-correct
Q.59 Unattempt
In a Young's double slit experiment, an angular width of the fringe is 0.35∘ on a screen placed at 2m away for particular wavelength of 450‌nm. The angular width of the fringe, when whole system is immersed in a medium of refractive index 7∕5, is ‌
1
α
. The value of α is____
[28-Jun-2022-Shift-2]
In a Young's double slit experiment, an angular width of the fringe is 0.35∘ on a screen placed at 2m away for particular wavelength of 450‌nm. The angular width of the fringe, when whole system is immersed in a medium of refractive index 7∕5, is ‌
1
α
. The value of α is____
[28-Jun-2022-Shift-2]
Q.60 Correct
Q.60 In-correct
Q.60 Unattempt
Using Young's double slit experiment, a monochromatic light of wavelength 5000
o
A
 produces fringes of fringe width 0.5 mm. If another monochromatic light of wavelength 6000
∘
A
 is used and the separation between the slits is doubled, then the new fringe width will be :
[29-Jun-2022-Shift-1]
Using Young's double slit experiment, a monochromatic light of wavelength 5000
o
A
 produces fringes of fringe width 0.5 mm. If another monochromatic light of wavelength 6000
∘
A
 is used and the separation between the slits is doubled, then the new fringe width will be :
[29-Jun-2022-Shift-1]
Q.61 Correct
Q.61 In-correct
Q.61 Unattempt
In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by 5×10−2m towards the slits, the change in fringe width is 3×10−3‌cm. If the distance between the slits is 1‌mm, then the wavelength of the light will be____ nm.
[29-Jun-2022-Shift-2]
In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distance from the plane of slits. If the screen is moved by 5×10−2m towards the slits, the change in fringe width is 3×10−3‌cm. If the distance between the slits is 1‌mm, then the wavelength of the light will be____ nm.
[29-Jun-2022-Shift-2]
Q.62 Correct
Q.62 In-correct
Q.62 Unattempt
In Young's double slit experiment, the fringe width is 12‌mm. If the entire arrangement is placed in water of refractive index ‌
4
3
, then the fringe width becomes (in mm):
[26-Jul-2022-Shift-1]
In Young's double slit experiment, the fringe width is 12‌mm. If the entire arrangement is placed in water of refractive index ‌
4
3
, then the fringe width becomes (in mm):
[26-Jul-2022-Shift-1]
Q.63 Correct
Q.63 In-correct
Q.63 Unattempt
In Young's double slit experiment, the fringe width is 12‌mm. If the entire arrangement is placed in water of refractive index ‌
4
3
, then the fringe width becomes (in mm):
[26-Jul-2022-Shift-1]
In Young's double slit experiment, the fringe width is 12‌mm. If the entire arrangement is placed in water of refractive index ‌
4
3
, then the fringe width becomes (in mm):
[26-Jul-2022-Shift-1]
Q.64 Correct
Q.64 In-correct
Q.64 Unattempt
Two coherent sources of light interfere. The intensity ratio of two sources is 1:4. For this interference pattern if the value of ‌
Imax+Imin
Imax−Imin
 is equal to ‌
2α+1
β+3
, then ‌
α
β
 will be :
[27-Jul-2022-Shift-2]
Two coherent sources of light interfere. The intensity ratio of two sources is 1:4. For this interference pattern if the value of ‌
Imax+Imin
Imax−Imin
 is equal to ‌
2α+1
β+3
, then ‌
α
β
 will be :
[27-Jul-2022-Shift-2]
Q.65 Correct
Q.65 In-correct
Q.65 Unattempt
In a Young's double slit experiment, a laser light of 560‌nm produces an interference pattern with consecutive bright fringes' separation of 7.2‌mm. Now another light is used to produce an interference pattern with consecutive bright fringes' separation of 8.1‌mm. The wavelength of second light is ________ nm.
[28-Jul-2022-Shift-1]
In a Young's double slit experiment, a laser light of 560‌nm produces an interference pattern with consecutive bright fringes' separation of 7.2‌mm. Now another light is used to produce an interference pattern with consecutive bright fringes' separation of 8.1‌mm. The wavelength of second light is ________ nm.
[28-Jul-2022-Shift-1]
Q.66 Correct
Q.66 In-correct
Q.66 Unattempt
An unpolarised light beam of intensity 2I0 is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of 30∘ relative to that of P. The intensity of the emergent light is
[29-Jul-2022-Shift-2]
An unpolarised light beam of intensity 2I0 is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of 30∘ relative to that of P. The intensity of the emergent light is
[29-Jul-2022-Shift-2]
Q.67 Correct
Q.67 In-correct
Q.67 Unattempt
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1µm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that
[25 Feb 2021 Shift 2]
Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1µm. If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that
[25 Feb 2021 Shift 2]
Q.68 Correct
Q.68 In-correct
Q.68 Unattempt
In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.
[24feb2021shift1]
In a Young's double slit experiment, the width of the one of the slit is three times the other slit. The amplitude of the light coming from a slit is proportional to the slit-width. Find the ratio of the maximum to the minimum intensity in the interference pattern.
[24feb2021shift1]
Q.69 Correct
Q.69 In-correct
Q.69 Unattempt
An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30circ in clockwise direction, the intensity of emerging light will be Lumens.
[24feb2021shift1]
An unpolarized light beam is incident on the polarizer of a polarization experiment and the intensity of light beam emerging from the analyzer is measured as 100 Lumens. Now, if the analyzer is rotated around the horizontal axis (direction of light) by 30circ in clockwise direction, the intensity of emerging light will be Lumens.
[24feb2021shift1]
Q.70 Correct
Q.70 In-correct
Q.70 Unattempt
In a Young's double slit experiment, two slits are separated by 2mm and the screen is placed one metre away. When a light of wavelength 500nm is used, the fringe separation will be
[26 Feb 2021 Shift 1]
In a Young's double slit experiment, two slits are separated by 2mm and the screen is placed one metre away. When a light of wavelength 500nm is used, the fringe separation will be
[26 Feb 2021 Shift 1]
Q.71 Correct
Q.71 In-correct
Q.71 Unattempt
Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio ‌
Imax−Imin
Imax+Imin
 will be
[25 Feb 2021 Shift 1]
Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio ‌
Imax−Imin
Imax+Imin
 will be
[25 Feb 2021 Shift 1]
Q.72 Correct
Q.72 In-correct
Q.72 Unattempt
If the source of light used in a Young's double slit experiment is changed from red to violet, then
[24 Feb 2021 Shift 2]
If the source of light used in a Young's double slit experiment is changed from red to violet, then
[24 Feb 2021 Shift 2]
Q.73 Correct
Q.73 In-correct
Q.73 Unattempt
In Young's double slit arrangement, slits are separated by a gap of 0.5mm, and the screen is placed at a distance of 0.5m from them. The distance between the first and the third bright fringe formed when the slits are illuminated by a monochromatic light of 5890Å is
[18 Mar 2021 Shift 1]
In Young's double slit arrangement, slits are separated by a gap of 0.5mm, and the screen is placed at a distance of 0.5m from them. The distance between the first and the third bright fringe formed when the slits are illuminated by a monochromatic light of 5890Å is
[18 Mar 2021 Shift 1]
Q.74 Correct
Q.74 In-correct
Q.74 Unattempt
A fringe width of 6mm was produced for two slits separated by 1mm apart. The screen is placed 10m away. The wavelength of light used is xnm. The value of x to the nearest integer is .........
[16 Mar 2021 Shift 1]
A fringe width of 6mm was produced for two slits separated by 1mm apart. The screen is placed 10m away. The wavelength of light used is xnm. The value of x to the nearest integer is .........
[16 Mar 2021 Shift 1]
Q.75 Correct
Q.75 In-correct
Q.75 Unattempt
A galaxy is moving away from the Earth at a speed of 286kms−1. The shift in the wavelength of a red line at 630nm is x×10−10m. The value of x to the nearest integer, is ...........
(Take the value of speed of light c, as 3×108ms−1 )
[18 Mar 2021 Shift 2]
A galaxy is moving away from the Earth at a speed of 286kms−1. The shift in the wavelength of a red line at 630nm is x×10−10m. The value of x to the nearest integer, is ...........
(Take the value of speed of light c, as 3×108ms−1 )
[18 Mar 2021 Shift 2]
Q.76 Correct
Q.76 In-correct
Q.76 Unattempt
In Young's double slit experiment, if the source of light changes from orange to blue then :
[27 Jul 2021 Shift 1]
In Young's double slit experiment, if the source of light changes from orange to blue then :
[27 Jul 2021 Shift 1]
Q.77 Correct
Q.77 In-correct
Q.77 Unattempt
In the Young's double slit experiment, the distance between the slits varies in time asd(t)=d0+a0‌sin‌ω‌t; where d0,ω and a0 are constants. The difference between the largest fringe width and the smallest fringe width obtained over time is given as :
[25 Jul 2021 Shift 1]
In the Young's double slit experiment, the distance between the slits varies in time asd(t)=d0+a0‌sin‌ω‌t; where d0,ω and a0 are constants. The difference between the largest fringe width and the smallest fringe width obtained over time is given as :
[25 Jul 2021 Shift 1]
Q.78 Correct
Q.78 In-correct
Q.78 Unattempt
With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 Å is observed at 5896 Å ?
[20 Jul 2021 Shift 2]
With what speed should a galaxy move outward with respect to earth so that the sodium-D line at wavelength 5890 Å is observed at 5896 Å ?
[20 Jul 2021 Shift 2]
Q.79 Correct
Q.79 In-correct
Q.79 Unattempt
White light is passed through a double slit and interference is observed on a screen 1.5m away. The separation between the slits is 0.3‌mm. The first violet and red fringes are formed 2.0‌mm and 3.5‌mm away from the central whitefringes. The difference in wavelengths of red and violet light is ...... nm.
[26 Aug 2021 Shift 1]
White light is passed through a double slit and interference is observed on a screen 1.5m away. The separation between the slits is 0.3‌mm. The first violet and red fringes are formed 2.0‌mm and 3.5‌mm away from the central whitefringes. The difference in wavelengths of red and violet light is ...... nm.
[26 Aug 2021 Shift 1]
Q.80 Correct
Q.80 In-correct
Q.80 Unattempt
A source of light is placed in front of a screen. Intensity of light on the screen is /. Two polaroids P1 and P2 are so placed in between the source of light and screen that the intensity of light on screen is
1
2
.P2 should be rotatedby an angle of .......... (degrees), so that the intensity of light on the screen becomes
31
8
.
[26 Aug 2021 Shift 2]
A source of light is placed in front of a screen. Intensity of light on the screen is /. Two polaroids P1 and P2 are so placed in between the source of light and screen that the intensity of light on screen is
1
2
.P2 should be rotatedby an angle of .......... (degrees), so that the intensity of light on the screen becomes
31
8
.
[26 Aug 2021 Shift 2]
Q.81 Correct
Q.81 In-correct
Q.81 Unattempt
In a Young's double slit experiment, the slits are separated by 0.3‌mm and the screen is 1.5m away from the plane of slits. Distance between fourth bright fringes on both sides of central bright is 2.4‌cm. The frequency of light used is.......... ×1014‌Hz.
[31 Aug 2021 Shift 2]
In a Young's double slit experiment, the slits are separated by 0.3‌mm and the screen is 1.5m away from the plane of slits. Distance between fourth bright fringes on both sides of central bright is 2.4‌cm. The frequency of light used is.......... ×1014‌Hz.
[31 Aug 2021 Shift 2]
Q.82 Correct
Q.82 In-correct
Q.82 Unattempt
The light waves from two coherent sources have same intensity I1=I2=I0. In interference pattern the intensity of light at minima is zero. What will be the intensity of light at maxima?
[27 Aug 2021 Shift 2]
The light waves from two coherent sources have same intensity I1=I2=I0. In interference pattern the intensity of light at minima is zero. What will be the intensity of light at maxima?
[27 Aug 2021 Shift 2]
Q.83 Correct
Q.83 In-correct
Q.83 Unattempt
The width of one of the two slits in a Young's double slit experiment is three times the other slit. If the amplitude of the light coming from a slit is proportional to the slit-width, the ratio of minimum to maximum intensity in the interference pattern is x:4 where x is .........
[1 Sep 2021 Shift 2]
The width of one of the two slits in a Young's double slit experiment is three times the other slit. If the amplitude of the light coming from a slit is proportional to the slit-width, the ratio of minimum to maximum intensity in the interference pattern is x:4 where x is .........
[1 Sep 2021 Shift 2]
Q.84 Correct
Q.84 In-correct
Q.84 Unattempt
In a Young’s double slit experiment 15 fringes are observed on a small portion of the screen when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen when another light source of wavelength λ is used. Then the value of λ is (in nm) ______.
[NA 9 Jan 2020 II]
In a Young’s double slit experiment 15 fringes are observed on a small portion of the screen when light of wavelength 500 nm is used. Ten fringes are observed on the same section of the screen when another light source of wavelength λ is used. Then the value of λ is (in nm) ______.
[NA 9 Jan 2020 II]
Q.85 Correct
Q.85 In-correct
Q.85 Unattempt
In a double-slit experiment, at a certain point on the screen the path difference between the two interfering waves is
1
8
 th of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is:
[8 Jan 2020 II]
In a double-slit experiment, at a certain point on the screen the path difference between the two interfering waves is
1
8
 th of a wavelength. The ratio of the intensity of light at that point to that at the centre of a bright fringe is:
[8 Jan 2020 II]
Q.86 Correct
Q.86 In-correct
Q.86 Unattempt
In a Young’s double slit experiment, the separation between the slits is 0.15 mm. In the experiment, a source of light of wavelength 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is:
[7 Jan 2020 II]
In a Young’s double slit experiment, the separation between the slits is 0.15 mm. In the experiment, a source of light of wavelength 589 nm is used and the interference pattern is observed on a screen kept 1.5 m away. The separation between the successive bright fringes on the screen is:
[7 Jan 2020 II]
Q.87 Correct
Q.87 In-correct
Q.87 Unattempt
The aperture diameter of telescope is 5m. The separation between the moon and the earth is 4×105 km. With light of wavelength of 5500 Å, the minimum separation between objects on the surface of moon, so that they are just resolved, is close to:
[9 Jan. 2020 I]
The aperture diameter of telescope is 5m. The separation between the moon and the earth is 4×105 km. With light of wavelength of 5500 Å, the minimum separation between objects on the surface of moon, so that they are just resolved, is close to:
[9 Jan. 2020 I]
Q.88 Correct
Q.88 In-correct
Q.88 Unattempt
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be zero, is:
[7 Jan. 2020 I]
A polarizer - analyser set is adjusted such that the intensity of light coming out of the analyser is just 10% of the original intensity. Assuming that the polarizer - analyser set does not absorb any light, the angle by which the analyser need to be rotated further to reduce the output intensity to be zero, is:
[7 Jan. 2020 I]
Q.89 Correct
Q.89 In-correct
Q.89 Unattempt
In a double slit experiment, when a thin film of thickness t having refractive index µ is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of t is (≈ is the wavelength of the light used) :
[12 April 2020 I]
In a double slit experiment, when a thin film of thickness t having refractive index µ is introduced in front of one of the slits, the maximum at the centre of the fringe pattern shifts by one fringe width. The value of t is (≈ is the wavelength of the light used) :
[12 April 2020 I]
Q.90 Correct
Q.90 In-correct
Q.90 Unattempt
In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90º. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio :

[Sep. 06, 2020 (I)]
In the figure below, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m. The separation between P and Q is 5 m and the phase of P is ahead of that of Q by 90º. A, B and C are three distinct points of observation, each equidistant from the midpoint of PQ. The intensities of radiation at A, B, C will be in the ratio :

[Sep. 06, 2020 (I)]
Q.91 Correct
Q.91 In-correct
Q.91 Unattempt
Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength, λ=1m, in phase. S1 and S2 are placed 1.5m apart (see fig.). A listener, located at L directly in front of S2 finds that the intensity is at a minimum when he is 2m away from S2. The listener moves away from S1, keeping his distance from S2 fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S1. Then, d is:

[Sep. 05,2020 (II)]
Two coherent sources of sound, S1 and S2, produce sound waves of the same wavelength, λ=1m, in phase. S1 and S2 are placed 1.5m apart (see fig.). A listener, located at L directly in front of S2 finds that the intensity is at a minimum when he is 2m away from S2. The listener moves away from S1, keeping his distance from S2 fixed. The adjacent maximum of intensity is observed when the listener is at a distance d from S1. Then, d is:

[Sep. 05,2020 (II)]
Q.92 Correct
Q.92 In-correct
Q.92 Unattempt
Two light waves having the same wavelength lambda in vacuum are in phase initially. Then the first wave travels a path L1 through a medium of refractive index n1 while the second wave travels a path of length L2 through a medium of refractive index n2. After this the phase difference between the two waves is :
[Sep. 03,2020 (II)]
Two light waves having the same wavelength lambda in vacuum are in phase initially. Then the first wave travels a path L1 through a medium of refractive index n1 while the second wave travels a path of length L2 through a medium of refractive index n2. After this the phase difference between the two waves is :
[Sep. 03,2020 (II)]
Q.93 Correct
Q.93 In-correct
Q.93 Unattempt
A young's double-slit experiment is performed using monochromatic light of wavelength λ. The intensity of light at a point on the screen, where the path difference is lambda, is K units. The intensity of light at a point where the path difference is
λ
6
 is given by
nK
12
, where n is an integer. The value of n is ________.
[NA Sep. 06, 2020 (II)]
A young's double-slit experiment is performed using monochromatic light of wavelength λ. The intensity of light at a point on the screen, where the path difference is lambda, is K units. The intensity of light at a point where the path difference is
λ
6
 is given by
nK
12
, where n is an integer. The value of n is ________.
[NA Sep. 06, 2020 (II)]
Q.94 Correct
Q.94 In-correct
Q.94 Unattempt
In a Young’s double slit experiment, light of 500 nm is used to produce an interference pattern. When the distance between the slits is 0.05 mm, the angular width (in degree) of the fringes formed on the distance screen is close to :
[Sep. 03, 2020 (I)]
In a Young’s double slit experiment, light of 500 nm is used to produce an interference pattern. When the distance between the slits is 0.05 mm, the angular width (in degree) of the fringes formed on the distance screen is close to :
[Sep. 03, 2020 (I)]
Q.95 Correct
Q.95 In-correct
Q.95 Unattempt
Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on a screen at a distance of 1.27 mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close to :
[Sep. 02, 2020 (I)]
Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (λ = 632.8 nm). The distance between the screen and the slits is 100 cm. If a bright fringe is observed on a screen at a distance of 1.27 mm from the central bright fringe, then the path difference between the waves, which are reaching this point from the slits is close to :
[Sep. 02, 2020 (I)]
Q.96 Correct
Q.96 In-correct
Q.96 Unattempt
In a Young's double slit experiment, 16 fringes are observed in a certain segment of the screen when light of wavelength 700 nm is used. If the wavelength of light is changed to 400 nm, the number of fringes observed in the same segment of the screen would be :
[Sep. 02, 2020 (II)]
In a Young's double slit experiment, 16 fringes are observed in a certain segment of the screen when light of wavelength 700 nm is used. If the wavelength of light is changed to 400 nm, the number of fringes observed in the same segment of the screen would be :
[Sep. 02, 2020 (II)]
Q.97 Correct
Q.97 In-correct
Q.97 Unattempt
A beam of plane polarised light of large cross-sectional area and uniform intensity of 3.3Wm−2 falls normally on a polariser (cross sectional area 3‌times‌10−4‌m2 ) which rotates about its axis with an angular speed of 31.4‌rad∕s. The energy of light passing through the polariser per revolution, is close to :
[Sep. 04, 2020 (I)]
A beam of plane polarised light of large cross-sectional area and uniform intensity of 3.3Wm−2 falls normally on a polariser (cross sectional area 3‌times‌10−4‌m2 ) which rotates about its axis with an angular speed of 31.4‌rad∕s. The energy of light passing through the polariser per revolution, is close to :
[Sep. 04, 2020 (I)]
Q.98 Correct
Q.98 In-correct
Q.98 Unattempt
Orange light of wavelength 6000×10−10m illuminates a single slit of width 0.6×10−4m. The maximum possible number of diffraction minima produced on both sides of the central maximum is ______.
[NA Sep. 04, 2020 (II)]
Orange light of wavelength 6000×10−10m illuminates a single slit of width 0.6×10−4m. The maximum possible number of diffraction minima produced on both sides of the central maximum is ______.
[NA Sep. 04, 2020 (II)]
Q.99 Correct
Q.99 In-correct
Q.99 Unattempt
Two coherent sources produce waves of different intensities which interfere. After interference, the ratio of the maximum intensity to the minimum intensity is 16. The intensity of the waves are in the ratio:
[9 Jan. 2019 I]
Two coherent sources produce waves of different intensities which interfere. After interference, the ratio of the maximum intensity to the minimum intensity is 16. The intensity of the waves are in the ratio:
[9 Jan. 2019 I]
Q.100 Correct
Q.100 In-correct
Q.100 Unattempt
In a Young’s double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is
1
8
th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to:
[11 Jan 2019 I]
In a Young’s double slit experiment, the path difference, at a certain point on the screen, between two interfering waves is
1
8
th of wavelength. The ratio of the intensity at this point to that at the centre of a bright fringe is close to:
[11 Jan 2019 I]
Q.101 Correct
Q.101 In-correct
Q.101 Unattempt
In a Young's double slit experiment with slit separation0.1mm, one observes a bright fringe at angle
1
40
rad by using light of wavelength λ1 When the light of wavelength λ2 is used a bright fringe is seen at the same angle in the same set up. Given that λ1 and λ2 are in visible range (380nm to 740nm), their values are:
[10 Jan. 2019 I]
In a Young's double slit experiment with slit separation0.1mm, one observes a bright fringe at angle
1
40
rad by using light of wavelength λ1 When the light of wavelength λ2 is used a bright fringe is seen at the same angle in the same set up. Given that λ1 and λ2 are in visible range (380nm to 740nm), their values are:
[10 Jan. 2019 I]
Q.102 Correct
Q.102 In-correct
Q.102 Unattempt
Consider a Young's double slit experiment as shown in figure. What should be the slit separation d in terms of wavelength λ such that the first minima occurs directly in front of the slit (S1)?

[10 Jan. 2019 II]
Consider a Young's double slit experiment as shown in figure. What should be the slit separation d in terms of wavelength λ such that the first minima occurs directly in front of the slit (S1)?

[10 Jan. 2019 II]
Q.103 Correct
Q.103 In-correct
Q.103 Unattempt
In a Young's double slit experiment, the slits are placed 0.320mm apart. Light of wavelength λ=500nm is incident on the slits. The total number of bright fringes that are observed in the angular range −30°≤θ≤30° is
[9 Jan. 2019 II]
In a Young's double slit experiment, the slits are placed 0.320mm apart. Light of wavelength λ=500nm is incident on the slits. The total number of bright fringes that are observed in the angular range −30°≤θ≤30° is
[9 Jan. 2019 II]
Q.104 Correct
Q.104 In-correct
Q.104 Unattempt
In a double-slit experiment, green light (5303Å) falls on a double slit having a separation of 19.44 µm and a width of 4.05 µm. The number of bright fringes between the first and the second diffraction minima is :
[11 Jan 2019 II]
In a double-slit experiment, green light (5303Å) falls on a double slit having a separation of 19.44 µm and a width of 4.05 µm. The number of bright fringes between the first and the second diffraction minima is :
[11 Jan 2019 II]
Q.105 Correct
Q.105 In-correct
Q.105 Unattempt
Consider a tank made of glass (refractive index 1.5) with a thick bottom. It is filled with a liquid of refractive index µ. A student finds that, irrespective of what the incident angle i (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of µ is:
[9 Jan. 2019 I]
Consider a tank made of glass (refractive index 1.5) with a thick bottom. It is filled with a liquid of refractive index µ. A student finds that, irrespective of what the incident angle i (see figure) is for a beam of light entering the liquid, the light reflected from the liquid glass interface is never completely polarized. For this to happen, the minimum value of µ is:
[9 Jan. 2019 I]
Q.106 Correct
Q.106 In-correct
Q.106 Unattempt
In an interference experiment the ratio of amplitudes of coherent waves is
a1
a2
=
1
3
. The ratio of maximum and minimum intensities of fringes will be :
[8 April 2019 I]
In an interference experiment the ratio of amplitudes of coherent waves is
a1
a2
=
1
3
. The ratio of maximum and minimum intensities of fringes will be :
[8 April 2019 I]
Q.107 Correct
Q.107 In-correct
Q.107 Unattempt
The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness t and refractive index
1
4
 is put in front of one of the slits, the central maximum gets shifted by a distance equal to n fringe widths. If the wavelength of light used is »,t will be:

[9 April 2019 I]
The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet of thickness t and refractive index
1
4
 is put in front of one of the slits, the central maximum gets shifted by a distance equal to n fringe widths. If the wavelength of light used is »,t will be:

[9 April 2019 I]
Q.108 Correct
Q.108 In-correct
Q.108 Unattempt
The value of numerical aperature of the objective lens of a microscope is 1.25. If light of wavelength 5000 Å is used, the minimum separation between two points, to be seen as distinct, will be :
[12 April 2019 I]
The value of numerical aperature of the objective lens of a microscope is 1.25. If light of wavelength 5000 Å is used, the minimum separation between two points, to be seen as distinct, will be :
[12 April 2019 I]
Q.109 Correct
Q.109 In-correct
Q.109 Unattempt
A system of three polarizers P1,P2,P3 is set up such that the pass axis of P3 is crossed with respect to that of P1. The pass axis of P2 is inclined at 60° to the pass axis of P3. When a beam of unpolarized light of intensity Io is incident on P1, the intensity of light transmitted by the three polarizers is I. The ratio (I0/I) equals (nearly):
[12 April 2019 II]
A system of three polarizers P1,P2,P3 is set up such that the pass axis of P3 is crossed with respect to that of P1. The pass axis of P2 is inclined at 60° to the pass axis of P3. When a beam of unpolarized light of intensity Io is incident on P1, the intensity of light transmitted by the three polarizers is I. The ratio (I0/I) equals (nearly):
[12 April 2019 II]
Q.110 Correct
Q.110 In-correct
Q.110 Unattempt
Diameter of the objective lens of a telescope is 250cm. For light of wavelength 600nm. Coming from a distant object, the limit of resolution of the telescope is close to:
[9 April 2019 II]
Diameter of the objective lens of a telescope is 250cm. For light of wavelength 600nm. Coming from a distant object, the limit of resolution of the telescope is close to:
[9 April 2019 II]
Q.111 Correct
Q.111 In-correct
Q.111 Unattempt
Calculate the limit of resolution of a telescope objective having a diameter of 200cm, if it has to detect light of wavelength 500nm coming from a star.
[8 April 2019 II]
Calculate the limit of resolution of a telescope objective having a diameter of 200cm, if it has to detect light of wavelength 500nm coming from a star.
[8 April 2019 II]
Q.112 Correct
Q.112 In-correct
Q.112 Unattempt
The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 µm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young's fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance?
(i.e. distance between the centres of each slit.)
[2018]
The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit is 1 µm. The slit is illuminated by monochromatic plane waves. If another slit of same width is made near it, Young's fringes can be observed on a screen placed at a distance 50 cm from the slits. If the observed fringe width is 1 cm, what is slit separation distance?
(i.e. distance between the centres of each slit.)
[2018]
Q.113 Correct
Q.113 In-correct
Q.113 Unattempt
Unpolarized light of intensity I passes through an ideal polarizer A. Another indentical polarizer B is placed behind A. The intensity of light beyond B is found to be
I
2
 . Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be
I
8
 . The angle between polarizer A and C is:
[2018]
Unpolarized light of intensity I passes through an ideal polarizer A. Another indentical polarizer B is placed behind A. The intensity of light beyond B is found to be
I
2
 . Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be
I
8
 . The angle between polarizer A and C is:
[2018]
Q.114 Correct
Q.114 In-correct
Q.114 Unattempt
Light of wavelength 550nm falls normally on a slit of width 22.0×10−5cm. The angular position of the second minima from the central maximum will be (in radians)
[Online April 15,2018]
Light of wavelength 550nm falls normally on a slit of width 22.0×10−5cm. The angular position of the second minima from the central maximum will be (in radians)
[Online April 15,2018]
Q.115 Correct
Q.115 In-correct
Q.115 Unattempt
Unpolarized light of intensity I is incident on a system of two polarizers, A followed by B. The intensity of emergent light is I∕2. If a third polarizer C is placed between A and B, the intensity of emergent light is reduced to I∕3. The angle between the polarizers A and C is θ. Then
[Online April 16,2018]
Unpolarized light of intensity I is incident on a system of two polarizers, A followed by B. The intensity of emergent light is I∕2. If a third polarizer C is placed between A and B, the intensity of emergent light is reduced to I∕3. The angle between the polarizers A and C is θ. Then
[Online April 16,2018]
Q.116 Correct
Q.116 In-correct
Q.116 Unattempt
A plane polarized light is incident on a polariser with its pass axis making angle q with x-axis, as shown in the figure. At four different values of q, q = 8°, 38°, 188° and 218°, the observed intensities are same. What is the angle between the direction of polarization and x-axis

[Online April 15,2018]
A plane polarized light is incident on a polariser with its pass axis making angle q with x-axis, as shown in the figure. At four different values of q, q = 8°, 38°, 188° and 218°, the observed intensities are same. What is the angle between the direction of polarization and x-axis

[Online April 15,2018]
Q.117 Correct
Q.117 In-correct
Q.117 Unattempt
In a Young's double slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is :
[2017]
In a Young's double slit experiment, slits are separated by 0.5 mm, and the screen is placed 150 cm away. A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both the wavelengths coincide is :
[2017]
Q.118 Correct
Q.118 In-correct
Q.118 Unattempt
An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light =3×108ms–1 )
[2017]
An observer is moving with half the speed of light towards a stationary microwave source emitting waves at frequency 10 GHz. What is the frequency of the microwave measured by the observer? (speed of light =3×108ms–1 )
[2017]
Q.119 Correct
Q.119 In-correct
Q.119 Unattempt
A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 Å and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is :
[Online April 9, 2017]
A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 Å and diffraction bands are observed on a screen 0.5 m from the slit. The distance of the third dark band from the central bright band is :
[Online April 9, 2017]
Q.120 Correct
Q.120 In-correct
Q.120 Unattempt
A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance l m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum?
(i.e. distance between first minimum on either side of the central maximum)
[Online April 8, 2017]
A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and fourth minima in the diffraction pattern at a distance l m from the slit are at 3 cm and 6 cm respectively from the central maximum, what is the width of the central maximum?
(i.e. distance between first minimum on either side of the central maximum)
[Online April 8, 2017]
Q.121 Correct
Q.121 In-correct
Q.121 Unattempt
The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength λ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say bmin ) when :
[2016]
The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illuminated by a parallel beam of light of wavelength λ the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size (say bmin ) when :
[2016]
Q.122 Correct
Q.122 In-correct
Q.122 Unattempt
Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30cm. The wavelength of light is 600nm. To see the stars just resolved by the telescope, the minimum distance between them should be ( 1 light year =9.46×1015m ) of the order of :
[Online April 10,2016]
Two stars are 10 light years away from the earth. They are seen through a telescope of objective diameter 30cm. The wavelength of light is 600nm. To see the stars just resolved by the telescope, the minimum distance between them should be ( 1 light year =9.46×1015m ) of the order of :
[Online April 10,2016]
Q.123 Correct
Q.123 In-correct
Q.123 Unattempt
In Young's double slit experiment, the distance between slits and the screen is 1.0m and monochromatic light of 600nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance d0 between the slits. If the angular resolution of the eye is
1°
60
, the value of d0 is close to
[Online April 9,2016]
In Young's double slit experiment, the distance between slits and the screen is 1.0m and monochromatic light of 600nm is being used. A person standing near the slits is looking at the fringe pattern. When the separation between the slits is varied, the interference pattern disappears for a particular distance d0 between the slits. If the angular resolution of the eye is
1°
60
, the value of d0 is close to
[Online April 9,2016]
Q.124 Correct
Q.124 In-correct
Q.124 Unattempt
On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam :
[2015]
On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam :
[2015]
Q.125 Correct
Q.125 In-correct
Q.125 Unattempt
In a Young's double slit experiment with light of wavelength λ the separation of slits is d and distance of screen is D such that D>>d>>λ. If the fringe width is β, the distance from point of maximum intensity to the point where intensity falls to half of maximum intensity on either side is:
[Online April 11,2015]
In a Young's double slit experiment with light of wavelength λ the separation of slits is d and distance of screen is D such that D>>d>>λ. If the fringe width is β, the distance from point of maximum intensity to the point where intensity falls to half of maximum intensity on either side is:
[Online April 11,2015]
Q.126 Correct
Q.126 In-correct
Q.126 Unattempt
Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is :
[2015]
Assuming human pupil to have a radius of 0.25 cm and a comfortable viewing distance of 25 cm, the minimum separation between two objects that human eye can resolve at 500 nm wavelength is :
[2015]
Q.127 Correct
Q.127 In-correct
Q.127 Unattempt
Unpolarized light of intensity I0 is incident on surface of a block of glass at Brewster’s angle. In that case, which one of the following statements is true ?
[Online April 11, 2015]
Unpolarized light of intensity I0 is incident on surface of a block of glass at Brewster’s angle. In that case, which one of the following statements is true ?
[Online April 11, 2015]
Q.128 Correct
Q.128 In-correct
Q.128 Unattempt
Interference pattern is observed at ‘P’ due to superimposition of two rays coming out from a source ‘S’ as shown in the figure. The value of ‘l’ for which maxima is obtained at ‘P’ is:
(R is perfect reflecting surface)

[Online April 12, 2014]
Interference pattern is observed at ‘P’ due to superimposition of two rays coming out from a source ‘S’ as shown in the figure. The value of ‘l’ for which maxima is obtained at ‘P’ is:
(R is perfect reflecting surface)

[Online April 12, 2014]
Q.129 Correct
Q.129 In-correct
Q.129 Unattempt
Two monochromatic light beams of intensity 16 and 9 units are interfering. The ratio of intensities of bright and dark parts of the resultant pattern is:
[Online April 11, 2014]
Two monochromatic light beams of intensity 16 and 9 units are interfering. The ratio of intensities of bright and dark parts of the resultant pattern is:
[Online April 11, 2014]
Q.130 Correct
Q.130 In-correct
Q.130 Unattempt
In a Young’s double slit experiment, the distance between the two identical slits is 6.1 times larger than the slit width. Then the number of intensity maxima observed within the central maximum of the single slit diffraction pattern is:
[Online April 19, 2014]
In a Young’s double slit experiment, the distance between the two identical slits is 6.1 times larger than the slit width. Then the number of intensity maxima observed within the central maximum of the single slit diffraction pattern is:
[Online April 19, 2014]
Q.131 Correct
Q.131 In-correct
Q.131 Unattempt
Using monochromatic light of wavelength λ , an experimentalist sets up the Young’s double slit experiment in three ways as shown.
If she observes that y=β’ , the wavelength of light used is:

[Online April 9, 2014]
Using monochromatic light of wavelength λ , an experimentalist sets up the Young’s double slit experiment in three ways as shown.
If she observes that y=β’ , the wavelength of light used is:

[Online April 9, 2014]
Q.132 Correct
Q.132 In-correct
Q.132 Unattempt
Two beams, A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30° makes the two beams appear equally bright. If the initial intensities of the two beams are IA andIB respectively, then
IA
IB
 equals:
[2014]
Two beams, A and B, of plane polarized light with mutually perpendicular planes of polarization are seen through a polaroid. From the position when the beam A has maximum intensity (and beam B has zero intensity), a rotation of polaroid through 30° makes the two beams appear equally bright. If the initial intensities of the two beams are IA andIB respectively, then
IA
IB
 equals:
[2014]
Q.133 Correct
Q.133 In-correct
Q.133 Unattempt
The diameter of the objective lens of microscope makes an angle beta at the focus of the microscope. Further, the medium between the object and the lens is an oil of refractive index n. Then the resolving power of the microscope
[Online April 19,2014]
The diameter of the objective lens of microscope makes an angle beta at the focus of the microscope. Further, the medium between the object and the lens is an oil of refractive index n. Then the resolving power of the microscope
[Online April 19,2014]
Q.134 Correct
Q.134 In-correct
Q.134 Unattempt
A ray of light is incident from a denser to a rarer medium. The critical angle for total internal reflection is θiC and Brewster's angle of incidence is θiB, such that sin‌θiC/ sin‌θiB=η=1.28. The relative refractive index of the two media is:
[Online April 19,2014]
A ray of light is incident from a denser to a rarer medium. The critical angle for total internal reflection is θiC and Brewster's angle of incidence is θiB, such that sin‌θiC/ sin‌θiB=η=1.28. The relative refractive index of the two media is:
[Online April 19,2014]
Q.135 Correct
Q.135 In-correct
Q.135 Unattempt
In an experiment of single slit diffraction pattern, first minimum for red light coincides with first maximum of some other wavelength. If wavelength of red light is 6600 Å, then wavelength of first maximum will be:
[Online April 12, 2014]
In an experiment of single slit diffraction pattern, first minimum for red light coincides with first maximum of some other wavelength. If wavelength of red light is 6600 Å, then wavelength of first maximum will be:
[Online April 12, 2014]
Q.136 Correct
Q.136 In-correct
Q.136 Unattempt
n identical waves each of intensity I0 interfere with each other. The ratio of maximum intensities if the interference is (i) coherent and (ii) incoherent is:
[Online April 23, 2013]
n identical waves each of intensity I0 interfere with each other. The ratio of maximum intensities if the interference is (i) coherent and (ii) incoherent is:
[Online April 23, 2013]
Q.137 Correct
Q.137 In-correct
Q.137 Unattempt
A ray of light of intensity I is incident on a parallel glass slab at point A as shown in diagram. It undergoes partial reflection and refraction. At each reflection, 25% of incident energy is reflected. The rays AB and A′B′ undergo interference. The ratio of Imax and Imin is :

[Online April 9, 2013]
A ray of light of intensity I is incident on a parallel glass slab at point A as shown in diagram. It undergoes partial reflection and refraction. At each reflection, 25% of incident energy is reflected. The rays AB and A′B′ undergo interference. The ratio of Imax and Imin is :

[Online April 9, 2013]
Q.138 Correct
Q.138 In-correct
Q.138 Unattempt
Two coherent point sources S1 and S2 are separated by a small distance 'd' as shown. The fringes obtained on the screen will be
[2013]
Two coherent point sources S1 and S2 are separated by a small distance 'd' as shown. The fringes obtained on the screen will be
[2013]
Q.139 Correct
Q.139 In-correct
Q.139 Unattempt
The source that illuminates the double - slit in 'double - slit interference experiment' emits two distinct monochromatic waves of wavelength 500 nm and 600 nm, each of them producing its own pattern on the screen. At the central point of the pattern when path difference is zero, maxima of both the patterns coincide and the resulting interference pattern is most distinct at the region of zero path difference.
But as one moves out of this central region, the two fringe systems are gradually out of step such that maximum due to on wavelength coincides with the minimum due to the other and the combined fringe system becomes completely indistinct. This may happen when path difference in nm is :
[Online April 25, 2013]
The source that illuminates the double - slit in 'double - slit interference experiment' emits two distinct monochromatic waves of wavelength 500 nm and 600 nm, each of them producing its own pattern on the screen. At the central point of the pattern when path difference is zero, maxima of both the patterns coincide and the resulting interference pattern is most distinct at the region of zero path difference.
But as one moves out of this central region, the two fringe systems are gradually out of step such that maximum due to on wavelength coincides with the minimum due to the other and the combined fringe system becomes completely indistinct. This may happen when path difference in nm is :
[Online April 25, 2013]
Q.140 Correct
Q.140 In-correct
Q.140 Unattempt
A thin glass plate of thickness is
2500
3
λ(λ is wavelength of light used) and refractive index µ=1.5 is inserted between one of the slits and the screen in Young's double slit experiment. At a point on the screen equidistant from the slits, the ratio of the intensities before and after the introduction of the glass plate is :
[Online April 25, 2013]
A thin glass plate of thickness is
2500
3
λ(λ is wavelength of light used) and refractive index µ=1.5 is inserted between one of the slits and the screen in Young's double slit experiment. At a point on the screen equidistant from the slits, the ratio of the intensities before and after the introduction of the glass plate is :
[Online April 25, 2013]
Q.141 Correct
Q.141 In-correct
Q.141 Unattempt
This question has Statement-1 and Statement-2. Of thefour choices given after the Statements, choose the onethat best describes the two Statements.
Statement-1: In Young’s double slit experiment, the number of fringes observed in the field of view is small with longer wavelength of light and is large with shorter wavelength of light.
Statement-2: In the double slit experiment the fringe width depends directly on the wavelength of light.
[Online April 22, 2013]
This question has Statement-1 and Statement-2. Of thefour choices given after the Statements, choose the onethat best describes the two Statements.
Statement-1: In Young’s double slit experiment, the number of fringes observed in the field of view is small with longer wavelength of light and is large with shorter wavelength of light.
Statement-2: In the double slit experiment the fringe width depends directly on the wavelength of light.
[Online April 22, 2013]
Q.142 Correct
Q.142 In-correct
Q.142 Unattempt
Abeam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is
[2013]
Abeam of unpolarised light of intensity I0 is passed through a polaroid A and then through another polaroid B which is oriented so that its principal plane makes an angle of 45° relative to that of A. The intensity of the emergent light is
[2013]
Q.143 Correct
Q.143 In-correct
Q.143 Unattempt
This question has Statement-1 and Statements-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement-1 : Out of radio waves and microwaves, the radio waves undergo more diffraction.
Statement-2 : Radio waves have greater frequency compared to microwaves.
[Online April 25, 2013]
This question has Statement-1 and Statements-2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement-1 : Out of radio waves and microwaves, the radio waves undergo more diffraction.
Statement-2 : Radio waves have greater frequency compared to microwaves.
[Online April 25, 2013]
Q.144 Correct
Q.144 In-correct
Q.144 Unattempt
A person lives in a high-rise building on the bank of a river 50 m wide. Across the river is a well lit tower of height 40 m. When the person, who is at a height of 10 m, looks through a polarizer at an appropriate angle at light of the tower reflecting from the river surface, he notes that intensity of light coming from distance X from his building is the least and this corresponds to the light coming from light bulbs at height 'Y' on the tower. The values of X and Y are respectively close to (refractive index of water ≃
4
3

[Online April 9, 2013]
A person lives in a high-rise building on the bank of a river 50 m wide. Across the river is a well lit tower of height 40 m. When the person, who is at a height of 10 m, looks through a polarizer at an appropriate angle at light of the tower reflecting from the river surface, he notes that intensity of light coming from distance X from his building is the least and this corresponds to the light coming from light bulbs at height 'Y' on the tower. The values of X and Y are respectively close to (refractive index of water ≃
4
3

[Online April 9, 2013]
Q.145 Correct
Q.145 In-correct
Q.145 Unattempt
Two coherent plane light waves of equal amplitude makes a small angle α(<<1) with each other. They fall almost normally on a screen. If λ is the wavelength of light waves, the fringe width Δx of interference patterns of the two sets of waves on the screen is
[Online May 19, 2012]
Two coherent plane light waves of equal amplitude makes a small angle α(<<1) with each other. They fall almost normally on a screen. If λ is the wavelength of light waves, the fringe width Δx of interference patterns of the two sets of waves on the screen is
[Online May 19, 2012]
Q.146 Correct
Q.146 In-correct
Q.146 Unattempt
In Young's double slit experiment, one of the slit is wider than other, so that amplitude of the light from one slit is double of that other slit. If Im be the maximum intensity, the resultant intensity I when they interfere at phase difference ϕ is given by:
[2012]
In Young's double slit experiment, one of the slit is wider than other, so that amplitude of the light from one slit is double of that other slit. If Im be the maximum intensity, the resultant intensity I when they interfere at phase difference ϕ is given by:
[2012]
Q.147 Correct
Q.147 In-correct
Q.147 Unattempt
In Young’s double slit interference experiment, the slit widths are in the ratio 1 : 25. Then the ratio of intensity at the maxima and minima in the interference pattern is
[Online May 26, 2012]
In Young’s double slit interference experiment, the slit widths are in the ratio 1 : 25. Then the ratio of intensity at the maxima and minima in the interference pattern is
[Online May 26, 2012]
Q.148 Correct
Q.148 In-correct
Q.148 Unattempt
The maximum number of possible interference maxima for slit separation equal to 1.8λ, where λ is the wavelength of light used, in a Young's double slit experiment is
[Online May 12, 2012]
The maximum number of possible interference maxima for slit separation equal to 1.8λ, where λ is the wavelength of light used, in a Young's double slit experiment is
[Online May 12, 2012]
Q.149 Correct
Q.149 In-correct
Q.149 Unattempt
In a Young's double slit experiment with light of wavelength λ, fringe pattern on the screen has fringe width β. When two thin transparent glass (refractive index µ ) plates of thickness t1 and t2(t1>t2) are placed in the path of the two beams respectively, the fringe pattern will shift by a distance
[Online May 7, 2012]
In a Young's double slit experiment with light of wavelength λ, fringe pattern on the screen has fringe width β. When two thin transparent glass (refractive index µ ) plates of thickness t1 and t2(t1>t2) are placed in the path of the two beams respectively, the fringe pattern will shift by a distance
[Online May 7, 2012]
Q.150 Correct
Q.150 In-correct
Q.150 Unattempt
The first diffraction minimum due to the single slit diffraction is seen at θ=30° for a light of wavelength 5000 Å falling perpendicularly on the slit. The width of the slit is
[Online May 12, 2012]
The first diffraction minimum due to the single slit diffraction is seen at θ=30° for a light of wavelength 5000 Å falling perpendicularly on the slit. The width of the slit is
[Online May 12, 2012]
Q.151 Correct
Q.151 In-correct
Q.151 Unattempt
Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either polaroid must be turned if the intensity is to drop by one-half is
[Online May 7, 2012]
Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either polaroid must be turned if the intensity is to drop by one-half is
[Online May 7, 2012]
Q.152 Correct
Q.152 In-correct
Q.152 Unattempt
This question has a paragraph followed by two statements, Statement – 1 and Statement – 2. Of the given fouralternatives after the statements, choose the one thatdescribes the statements.
A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film.
Statement – 1 : When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of π.
Statement – 2 : The centre of the interference pattern is dark.
[2011]
This question has a paragraph followed by two statements, Statement – 1 and Statement – 2. Of the given fouralternatives after the statements, choose the one thatdescribes the statements.
A thin air film is formed by putting the convex surface of a plane-convex lens over a plane glass plate. With monochromatic light, this film gives an interference pattern due to light reflected from the top (convex) surface and the bottom (glass plate) surface of the film.
Statement – 1 : When light reflects from the air-glass plate interface, the reflected wave suffers a phase change of π.
Statement – 2 : The centre of the interference pattern is dark.
[2011]
Q.153 Correct
Q.153 In-correct
Q.153 Unattempt
At two points P and Q on screen in Young's double slit experiment, waves from slits S1 and S2 have a path difference of 0 and
λ
4
, respectively. The ratio of intensities at P and Q will be:
[2011 RS]
At two points P and Q on screen in Young's double slit experiment, waves from slits S1 and S2 have a path difference of 0 and
λ
4
, respectively. The ratio of intensities at P and Q will be:
[2011 RS]
Q.154 Correct
Q.154 In-correct
Q.154 Unattempt
In a Young's double slit experiment, the two slits act as coherent sources of wave of equal amplitude A and wavelength λ. In another experiment with the same arrangement the two slits are made to act as incoherent sources of waves of same amplitude and wavelength. If the intensity at the middle point of the screen in the first case is I1 and in the second case is I2, then the ratio
I1
I2
 is
[2011 RS]
In a Young's double slit experiment, the two slits act as coherent sources of wave of equal amplitude A and wavelength λ. In another experiment with the same arrangement the two slits are made to act as incoherent sources of waves of same amplitude and wavelength. If the intensity at the middle point of the screen in the first case is I1 and in the second case is I2, then the ratio
I1
I2
 is
[2011 RS]
Q.155 Correct
Q.155 In-correct
Q.155 Unattempt
Statement - 1: On viewing the clear blue portion of the sky through a Calcite Crystal, the intensity of transmitted light varies as the crystal is rotated.
Statement - 2: The light coming from the sky is polarized due to scattering of sun light by particles in the atmosphere. The scattering is largest for blue light.
[2011 RS]
Statement - 1: On viewing the clear blue portion of the sky through a Calcite Crystal, the intensity of transmitted light varies as the crystal is rotated.
Statement - 2: The light coming from the sky is polarized due to scattering of sun light by particles in the atmosphere. The scattering is largest for blue light.
[2011 RS]
Q.156 Correct
Q.156 In-correct
Q.156 Unattempt
As the beam enters the medium , it will
[2010]
As the beam enters the medium , it will
[2010]
Q.157 Correct
Q.157 In-correct
Q.157 Unattempt
The initial shape of the wavefront of the beam is
[2010]
The initial shape of the wavefront of the beam is
[2010]
Q.158 Correct
Q.158 In-correct
Q.158 Unattempt
The speed of light in the medium is
[2010]
The speed of light in the medium is
[2010]
Q.159 Correct
Q.159 In-correct
Q.159 Unattempt
A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young’s double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is:
[2009]
A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young’s double slit and gives rise to two overlapping interference patterns on the screen. The central maximum of both lights coincide. Further, it is observed that the third bright fringe of known light coincides with the 4th bright fringe of the unknown light. From this data, the wavelength of the unknown light is:
[2009]
Q.160 Correct
Q.160 In-correct
Q.160 Unattempt
In an experiment, electrons are made to pass through a narrow slit of width ‘d’ comparable to their de Broglie wavelength.
They are detected on a screen at a distance ‘D’ from the slit (see figure).

Which of the following graphs can be expected to represent the number of electrons ‘N’ detected as a function of the detector position ‘y’(y = 0 corresponds to the middle of the slit)
[2008]
In an experiment, electrons are made to pass through a narrow slit of width ‘d’ comparable to their de Broglie wavelength.
They are detected on a screen at a distance ‘D’ from the slit (see figure).

Which of the following graphs can be expected to represent the number of electrons ‘N’ detected as a function of the detector position ‘y’(y = 0 corresponds to the middle of the slit)
[2008]
Q.161 Correct
Q.161 In-correct
Q.161 Unattempt
In a Young's double slit experiment the intensity at a point where the path difference is
λ
6
(λ being the wavelength of light used) is I. If I0 denotes the maximum intensity,
I
I0
 is equal to
[2007]
In a Young's double slit experiment the intensity at a point where the path difference is
λ
6
(λ being the wavelength of light used) is I. If I0 denotes the maximum intensity,
I
I0
 is equal to
[2007]
Q.162 Correct
Q.162 In-correct
Q.162 Unattempt
A Young’s double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is
[2005]
A Young’s double slit experiment uses a monochromatic source. The shape of the interference fringes formed on a screen is
[2005]
Q.163 Correct
Q.163 In-correct
Q.163 Unattempt
If I0 is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled?
[2005]
If I0 is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its intensity when the slit width is doubled?
[2005]
Q.164 Correct
Q.164 In-correct
Q.164 Unattempt
When an unpolarized light of intensity I0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is
[2005]
When an unpolarized light of intensity I0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is
[2005]
Q.165 Correct
Q.165 In-correct
Q.165 Unattempt
Two point white dots are 1 mm apart on a black paper.They are viewed by eye of pupil diameter 3 mm.Approximately, what is the maximum distance at which these dots can be resolved by the eye?
[Take wavelength of light = 500 nm]
[2005]
Two point white dots are 1 mm apart on a black paper.They are viewed by eye of pupil diameter 3 mm.Approximately, what is the maximum distance at which these dots can be resolved by the eye?
[Take wavelength of light = 500 nm]
[2005]
Q.166 Correct
Q.166 In-correct
Q.166 Unattempt
The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is
[2004]
The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young’s double-slit experiment is
[2004]
Q.167 Correct
Q.167 In-correct
Q.167 Unattempt
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index n ), is
[2004]
The angle of incidence at which reflected light is totally polarized for reflection from air to glass (refractive index n ), is
[2004]
Q.168 Correct
Q.168 In-correct
Q.168 Unattempt
To demonstrate the phenomenon of interference, we require two sources which emit radiation
[2003]
To demonstrate the phenomenon of interference, we require two sources which emit radiation
[2003]
Q.169 Correct
Q.169 In-correct
Q.169 Unattempt
Wavelength of light used in an optical instrument are λ1=4000Å and λ2=25000Å , then ratio of their respective resolving powers (corresponding to λ1 and λ2 ) is
[2002]
Wavelength of light used in an optical instrument are λ1=4000Å and λ2=25000Å , then ratio of their respective resolving powers (corresponding to λ1 and λ2 ) is
[2002]
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