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Q.

The polaroids P1, P2 and P3 are arranged coaxially. The angle between P1 and  P2 is  370. The angle between P2 and P3 is θ if intensity of emerging light is a quarter of intensity of unpolarized light then θ is equal to

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a

cos-145

b

cos-135

c

cos-1452

d

cos-1542

answer is D.

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Detailed Solution

according to Malus law the intensity of emergent light will be I2cos2θ1cos2θ2  = I4   according to given condition121625cos2θ2=14 cos2θ2=2532   cosθ2=542
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