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Question

Unpolarized light of intensity I0 is incident on a set of 3 polaroids as shown. The pass axis of each polaroid is perpendicular to direction of propagation. One of the polaroid is rotated about the common direction of propagation of light.
992741_b2f9fc67739747f38c7e994562188004.PNG

A
If A is rotated, the final intensity remain unchanged.
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B
If B is rotated, the final intensity will change.
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C
If B is rotated, the final intensity remains unchanged.
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D
If C is rotated, the final intensity remains unchanged.
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Solution

The correct option is B If B is rotated, the final intensity will change.
The intensity of light defend upon Angular diff between the axies of pdaroid
I=Iocos2θ
where θ= angle between axies of pdaroi
So If we rotate B then angle between axies of (A,B) and (B,C) both changed we get final intensity changed

1438959_992741_ans_bfe190d3f4364575b7688f0727bbc58a.png

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