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Q.

Unpolarized light of intensity I passes through an ideal polarizer “A”. Another identical polarizer B is placed behind ‘A”. The Intensity of light beyond B is found to be $\frac{I}{2}$ . Now another identical polarizer ‘C’ is placed between A and B.If the intensity beyond B is now found to be $\frac{I}{8}$ , then the angle between polarizer A and C is

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a

$60^{\circ}$

b

$30^{\circ}$

c

$45^{\circ}$

d

$0^{\circ}$

answer is A.

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$\frac{I}{2} \cos^{4} θ = \frac{I}{8} \Rightarrow \cos θ = \frac{1}{\sqrt{2}} θ = 45 °$

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Unpolarized light of intensity I passes through an ideal polarizer “A”. Another identical polarizer B is placed behind ‘A”. The Intensity of light beyond B is found to be I2. Now another identical polarizer ‘C’ is placed between A and B.If the intensity beyond B is now found to be I8, then the angle between polarizer A and C is