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A beam of unpolarised light is incident ...

A beam of unpolarised light is incident on a tourmaline crystal. The intensity of the emergent light is `I_0`. The emergent light is incident on another tourmaline crystal. It is found that no light emerges out of the second crystal. If now, the first crystal is rotated through `45^@`, the intensity of the light emerging through the second crystal will be :

A

zero

B

`0.25 I_0`

C

`0.50 I_0`

D

`0.75 I_0`.

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