Two polaroids are placed in the path of ...

Two polaroids are placed in the path of unpolarized beam of intensity `I_(0)` such that no light is emitted from the second polarid. If a third polaroid whose polarization axis makes an angle `theta` with the polarization axis of first polaroid, is placed between these two polariods then the intensity of light emerging from the last polaroid will be

`(I_0/8)sin^2(2theta)`

`(I_0/4)sin^2(2theta)`

`(I_0/2)cos^4(theta)`

`I_0cos^4theta`

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