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JEE Main 2022 (29 Jul, Shift 2) · Polarisation

Polarisation question from JEE Main 2022 (29 Jul, Shift 2)

Q43JEE Main 2022 · 29 JUL · SHIFT 2Easy

Polarisation

An unpolarised light beam of intensity $2I_0$ is passed through a polaroid P and then through another polaroid Q which is oriented in such a way that its passing axis makes an angle of $30^\circ$ relative to that of P. The intensity of the emergent light is

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Answer: (c)

After P: $I_1 = \dfrac{2I_0}{2} = I_0$ .
After Q: $I_2 = I_0\cos^2 30^\circ = I_0\times\dfrac{3}{4}$
So the answer is (c) $\dfrac{3I_0}{4}$ .

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