Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either polaroid must be turned if the intensity is to drop by o

Question

Two polaroids have their polarizing directions parallel so that the intensity of a transmitted light is maximum. The angle through which either polaroid must be turned if the intensity is to drop by one-half is

TestHub · Accepted Answer

For I = 2 I 0 ​ ​ and I = I 0 ​ cos 2 θ = 2 I 0 ​ ​ ∴ θ = 4 5 ∘ Therefore the angle through which either polaroids turned is 13 5 ∘ ( = 18 0 ∘ − 4 5 ∘ )

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