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6.1-7 Half-Wave Retarder. Consider linearly polarized light passed through a half-wave retarder.
If the polarization plane makes an angle 0 with the fast axis of the retarder, show that the
transmitted light is linearly polarized at an angle -6, i.e., it is rotated by an angle 20. Why is
the half-wave retarder not equivalent to a polarization rotator?

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