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Single Slit Diffraction

In young's ex...

Question

In young's experiment the monochromatic light is used to illuminate two slits A and B as shown in figure. Interference fringes are observed on a screen placed in front of the slits. Now a thin glass plate is placed normally in the path of beam coming from the slit A, then.

A

There will be no change in fringe width

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B

Fringe width will decrease

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C

Fringe width will increase

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D

Fringes will disappear

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Solution

The correct option is A There will be no change in fringe width
When we put a glass plate in the path of one of the beams interfering with each other then there is change of place of fringes on the screen. All the fringes including central fringe are shifted. It does not result in change of fringe width.

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