First slide

In YDSE one of the slits is covered with a thin transparent sheet

Question

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

Easy

A

The fringes will disappear
B

The fringe width will increase
C

The fringe width will decrease
D

There will be no change in the fringe width but the pattern shifts

Solution

In the presence of thin glass plate, the fringe pattern shifts, but no change in fringe width.

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