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A beam of unpolarised light of intensity I₀ 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° relative to that of A. The intensity of the emergent light is

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I₀

I₀/4

I₀/2

I₀/8

answer is C.

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Detailed Solution

Relation between intensities
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$I_{r} = (\frac{I_{0}}{2}) \cos^{2} (45^{\circ}) = \frac{I_{0}}{2} \times \frac{1}{2} = \frac{I_{0}}{4}$

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