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A beam of initially unpolarized light passes through a sequence of three ideal polarizers. The angle...

A beam of initially unpolarized light passes through a sequence of three ideal polarizers. The angle ϕ12 between the axes of the first and second polarizers is 21.3∘, and the angle ϕ23 between the axes of the second and third polarizers is 54.5∘. What is the ratio of the intensity I3 of light emerging from the third polarizer to the intensity I0 of light incident on the first polarizer?

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