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A beam of unpolarised light of intensity I 0 is passed through a Polaroid A and then through another Polaroid B which is oriented so that its principal plane makes an angle of 45 o relative to that of A. The intensity of emergent light is:

1. I 0 /8
2. I 0 /4
3. I 0 /2
4. I 0

Correct answer: I 0 /4

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