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In the figure below, unpolarized light is transmitted through a set of two polarizers. The blue arrows indicated the direction of the transmission axis of the polarizers.
Created for Albert.io. Copyright 2016. All rights reserved.
What must the angle $\theta$ be (in degrees) so that the light transmitted through the second polarizer is 1/5 the intensity of the unploarized light? Do not put any units in the answer box.