A beam of unpolarized light of intensity I_0 is passed through a polaroid A, then through another polaroid B, oriented at 60^ and finally through another polaroid C, oriented at 45^ relative to B as shown. The intensity of emergent light is:

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Correct answer: A. I_0 16

I_1= I_0 2 I_B= (I_1 ) ^2 60^ = I_0 2 ( 1 2 )^2= I_0 8 I_C=I_B ^2 45^ = I_0 8 ( 1 2 )^2= I_0 16

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