JEE Main 2022 · 29 Jul · Shift 2 · Physics Q39

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PhysicsSingle correct+4 / -1Question 39 of 90

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° relative to that of P. The intensity of the emergent light is

\dfrac{I_0}4

\dfrac{I_0}2

\dfrac{3I_0}4

\dfrac{3I_0}2

Answer and worked solution

Official answer: C

Malus. The first polaroid passes $I_0$ ; the second $I_0\cos^230°=\frac{3I_0}4$ .

(C)

Topics:Polarisation and Brewster's law

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JEE Main 2022 · 29 Jul · Shift 2, Physics question 39