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Two 'crossed' polaroids A and B are plac...

Two 'crossed' polaroids A and B are placed in the path of a light-beam. In between these, a third polaroid is C is placed whose polarisation axis makes an angel `theta` with a polarisation axis of the polaroid A. If the intensity of light emerging from the poloaroid a is `I_(o)` then show that the intensity of light emerging from polaroid B will be `1/4I_(o) sin^(2)theta.`

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