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Polarized light of intensity I(0) is inc...

Polarized light of intensity `I_(0)` is incident on a pair of Polaroid sheets. Let `theta_(1)` and `theta_(2)` be the angles between the incident amplitude and the axes of the first and second sheet, respectively. Show that the intensity of the transmitted light is `I=I_(0)cos^(2)theta_(1)cos^(2)(theta_(1)-theta_(2))`.

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