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Two polaroids $P_{1} & P_{2}$ are arranged in a line such that their pass axes are at angle of $30 °$ with each other. If unpolarised light of intensity $I_{0}$ is incident on polaroid $P_{1}$ then intensity of light passing out from polaroid $P_{2}$ will be

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$\frac{{3I}_{0}}{8}$

$\frac{I_{0}}{4}$

$\frac{I_{o}}{2}$

$\frac{I_{0}}{8}$

answer is A.

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Detailed Solution

From Malus law $I = \frac{I_{0}}{2} \cos^{2} θ$

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