As shown in figures, three identical polaroids P 1 , P 2 and P 3 are placed one after another. The pass axis of P 2 and P 3 are inclined at angle of 60° and 90° with respect to axis of pi. The source S has an intensity of 256 
. The intensity of light at point is -------------------- 
.
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By first polaroid P1 intensity will be halved then P2 and P3 will make intensity cos 2 (60°) and cos 2 (30 0 ) times respectively.
Intensity out = 
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