Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : In YDSE number of bright fringe or dark fringe can not be unlimited

Reason : In YDSE path difference between the superposing waves can not be more than the distance between the slits.

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Coloured spectrum is seen when we look through a muslin cloth.

Reason : It is due to the diffraction of white light on passing through fine slits.

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : According to Huygen’s principle, no backward wave-front is possible.

Reason : Amplitude of secondary wavelet is proportional to (1 + cos θ) where θ is the angle between the ray at the point of consideration and the direction of secondary wavelet.

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : No interference pattern is detected when two coherent sources are infinitely close to each other.

Reason : The fringe width is inversely proportional to the distance between the two sources.

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : White light falls on a double slit with one slit is covered by a green filter. The bright fringes observed are of green colour.

Reason : The fringes observed are coloured.

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : In Young ’s double slit experiment if wavelength of incident monochromatic light is just doubled, the number of bright fringes on the screen will increase.

Reason : Maximum number of bright fringe on the screen is inversely proportional to the wavelength of light used

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Interference pattern is made by using yellow light instead of red light, the fringes become narrower.

Reason : In YDSE, fringe width is given by β=λD/d

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Diffraction takes place for all types of waves mechanical or nonmechanical, transverse or longitudinal.

Reason : Diffraction’s effects are perceptible only if wavelength of wave is comparable to dimensions of diffracting device.