A beam of unpolarized light of intensity $I_{0}$ is passed through a polaroid $A$ , then through another polaroid $B$ , oriented at $6 0^{\circ}$ and finally through another polaroid $C$ , oriented at $4 5^{\circ}$ relative to $B$ as shown. The intensity of emergent light is:
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I 1 ​ = 2 I 0 ​ ​ I B ​ = ( I 1 ​ ) cos 2 6 0 ∘ = 2 I 0 ​ ​ ( 2 1 ​ ) 2 = 8 I 0 ​ ​ I C ​ = I B ​ cos 2 4 5 ∘ = 8 I 0 ​ ​ × ( 2 ​ 1 ​ ) 2 = 16 I 0 ​ ​

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