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Two polaroids P1 and P2 are placed with ...

Two polaroids `P_1` and `P_2` are placed with their axis perpendicular to each other Unpolarised Light`I_0` is incident on `P_1`.A third polaroid `P_3` is kept in between `P_1` and `P_2` such that its axis makes an angle `45^@` with that of `P_1` the intensity of transmitted light through `P_2` is

A

`I_0/4`

B

`I_0/8`

C

`I_0/16`

D

`I_0/20`

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