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A beam of unpolarised light is passed fi...

A beam of unpolarised light is passed first through tourmaline crystan A and then through another tourmaline crystal B oriented so that its principal plane is parallel to that of A. The intensity of the emergent light is I. If A now rotated by `45^(@)` in a plane perpendicular to the direction of the incident ray, the intensity of the emergent light will be

A

`I/2`

B

`I/sqrt(2)`

C

`I`

D

`I/4`

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The correct Answer is:
A
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