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. The intensity beyond B is now found to be \frac{I}{8}. The angle between polarizer A and C is:

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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 $\frac{I}{2}$ . Now another identical polarizer C is placed between A and B. The intensity beyond B is now found to be $\frac{I}{8}$ . The angle between polarizer A and C is:

30º

60º

45º

0º

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Intensity after a = $\frac{I}{2}$

Intensity after b = $\frac{I}{2}$

so, transmission axis of a and b are parallel.

So, angle between A and C is 45°

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