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Unpolarized light of intensity I is inci...

Unpolarized light of intensity I is incident on a system of two polarizers, A followed by B. The intensity of emergent light is `I/2`. If a third polarizer C is placed between A and B, the intensity of emergent light is reduced to `I/3`. The angle between the polarizers A and C is `theta`. Then :

A

`costheta=((2)/(3))^((1)/(4))`

B

`costheta=((1)/(3))^((1)/(4))`

C

`costheta=((1)/(3))^((1)/(2))`

D

`costheta=((2)/(3))^((1)/(2))`

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The correct Answer is:
A
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