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NEET 2017 · Polarisation

Polarisation question from NEET 2017

Q56NEET 2017Medium

Polarisation

Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light $I$ 0 is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2 is

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Answer: (b)

$P_3$ is at $45^\circ$ to $P_1$ and $45^\circ$ to $P_2$ .
$I = \frac{I_0}{2}\cos^2 45^\circ\cos^2 45^\circ = \frac{I_0}{2}\cdot\frac{1}{4}$
So the answer is (b) $\frac{I_0}{8}$ .

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