NEETPhysicsWave OpticsMCQ+4 / −1
The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at from the polarization axis of one of the polaroids, is ( is the intensity of polarised light after passing through the first polaroid):
- A
- B
- C
- D
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Correct answer: A
$$\begin{aligned} \& I_1=I_0 \cos ^2\left(\frac{45}{2}\right) \\ \& I_2=I_1 \cos ^2\left(90-\frac{45}{2}\right) \\ \& =I_0 \cos ^2\left(\frac{45}{2}\right) \sin ^2\left(\frac{45}{2}\right) \\ \& =\frac{I_0}{4}\left(4 \cos ^2\left(\frac{45}{2}\right) \sin ^2\left(\frac{45}{2}\right)\right) \\ \& =\frac{I_0}{4} \sin ^2 45^{\circ}=\frac{I_0}{8} \end{aligned}$$
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