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We report the first positive experimental observation of the optical activity effect on normal reflection. The experiment was performed along the optic axis in a gyrotropic semiconductor crystal of {α}-HgS, cinnabar, in a spectral region of strong absorption. Reflected light polarization azimuth rotation resulting from the reflection is in the order of 10^-4 rad and has pronounced dependence on {}{ω}-Eg.
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Bungay et al. (1993) studied this question.
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