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Chapter 29 Problem 27 † Given θ = 70◦ Solution Find the fraction of vertically polarized light that passes through a polarizer at 70◦ . From Malus’ Law S = S0 cos2 θ The ratio of output to input is then S = cos2 θ = cos2 (70◦ ) = 0.117 S0 Therefore, only 11.7 % of the light passes through the polarizer. † Problem from Essential University Physics, Wolfson