Prove that, if I is the intensity of light transmitted by two polarizing filters with axes at
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Prove that, if I is the intensity of light transmitted by two polarizing filters with axes at an angle and I' is the intensity when the axes are at an angle 90.0° - θ, then I + I′ = I0, the original intensity. ( Use the trigonometric identities cos (90.0° - θ)= sin θ and cos2 θ + sin2 θ = 1.)
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