A beam of unpolarized light of intensity I0 is passed through a polaroid A, then through another polaroid B, oriented at 60° and finally through another polaroid C, oriented at 45 ° relative to B as shown. The intensity of emergent light is: (a) I₀/16 (b) I₀/4 (c) I₀/2 (d) I₀/32

Answer: (a). After A: I₁ = I₀/2. After B ( 60°): I₀/2cos ² 60° = I₀/8 After C ( 45° to B): I₀/8cos ² 45° = I₀/16 So the answer is (a) I₀/16.

A beam of unpolarized light of intensity I0 is passed through a… | NEET 2024

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Polarisation

A beam of unpolarized light of intensity I0 is passed through a polaroid A, then through another polaroid B, oriented at $60^\circ$ and finally through another polaroid C, oriented at 45 ${}^\circ$ relative to B as shown. The intensity of emergent light is:

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Answer: (a)

After A: $I_1 = I_0/2$ .
After B ( $60^\circ$ ): $\frac{I_0}{2}\cos^2 60^\circ = \frac{I_0}{8}$
After C ( $45^\circ$ to B): $\frac{I_0}{8}\cos^2 45^\circ = \frac{I_0}{16}$
So the answer is (a) $\frac{I_0}{16}$ .

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