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Question

Two ideal polaroid sheets are arranged so that the angle between the pass-axis of the two sheets is θ. An unpolarised beam of light of intensity I 0 is incident on one of the polaroids. If the intensity of light emerging from the other polaroid is I 0 / 4, the angle θ is:

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Explanation

Transmitted intensity I=I0/2 cos^2θ per Malus law after first polarizer.

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