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Wave Optics Test - 7
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Wave Optics Test - 7
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  • Question 1/10
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    Diffraction also refers to

     

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    Diffraction is defined as the process by which a beam of light or other system of waves is spread out as a result of passing through a narrow aperture or across an edge, typically accompanied by interference between the waveforms produced.

     

     

  • Question 2/10
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    Shape of the wave front of light emerging out of a convex lens when a point source is placed at its focus.

     

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    Plane. The shape of the wavefront in case of a light emerging out of a convex lens when a point source is placed at its focus is a parallel grid.

     

     

  • Question 3/10
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    A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young ’s double-slit experiment. Find the distance of the third bright fringe on the screen from the central maximum for wavelength 650 nm.

     

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  • Question 4/10
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    A beam of light has a wavelength of 650 nm in vacuum. What is the wavelength of these waves in the liquid whose index of refraction at this wavelength is 1.47?

     

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    We know that,
    Wavelength of light in a material:
    λ= λ0 /n
    where, λ=wavelength of material, λ0 =wavelength of light in vacuum,
    n=index of refraction of material.
    So, 650x10-9 m/1.47=442.177nm.

     

     

  • Question 5/10
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    wave front is

     

  • Question 6/10
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    A beam of light consisting of two wavelengths, 650 nm and 520 nm, is used to obtain interference fringes in a Young ’s double-slit experiment. What is the least distance from the central maximum where the bright fringes due to both the wavelengths coincide?

     

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  • Question 7/10
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    A parallel beam of light in air makes an angle of 47.5∘  with the surface of a glass plate having a refractive index of 1.66. What is the angle between the reflected part of the beam and the surface of the glass?

     

    Solutions

     

     

    The angle of incidence = 90∘ - 47.5∘ = 42.5∘
    Now by snells ’laws we get  
    sin r = sin 42.5∘ / 1.66∘
    Thus we get r = 24.01∘
    Thus the angle with surface = 90∘ -24.01∘ = 65.99∘

     

     

  • Question 8/10
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    Shape of the wave front of portion of the wave front of light from a distant star intercepted by the Earth

     

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    Plane (a small area on the surface of a large sphere is nearly planar). The portion of the wavefront of light from a distant star intercepted by the Earth is a plane.

     

     

  • Question 9/10
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    Which of the following phenomenon cannot be explained by diffraction?

     

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    The bright colors seen in an oil slick floating on water or in a sunlit soap bubble are caused by interference. The brightest colors are those that interfere constructively. This interference is between light reflected from different surfaces of a thin film; thus, the effect is known as thin film interference.

     

     

  • Question 10/10
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    According to Huygens principle

     

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    Every point on a wave-front may be considered a source of secondary spherical wavelets which spread out in the forward direction at the speed of light. The new wave-front is the tangential surface to all of these secondary wavelets.

    According to Huygens 'principle, a plane light wave propagates though free space at the speed of light, c. The light rays associated with this wave-front propagate in straight-lines. It is also fairly straightforward to account for the laws of reflection and refraction using Huygens 'principle.

     

     

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