First slide

Coherent sources and their importance in interference

Question

In Young's double slit experiment, a glass plate is placed before a slit which absorbs half the intensity of light. Under this case

Easy

A

The brightness of fringes decreases
B

The fringe width decreases
C

No fringes will be observed
D

The bright fringes become fainter and the dark fringes have finite light intensity

Solution

As the slits are producing now unequal amplitudes, the interference cannot produce complete dark and complete bright fringes.

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