Abstract
Low order interference curves in optic-axis light figures of the optically active AgGaS 2 and TeO 2 are investigated in the visible spectral range at room temperature. Light figure patterns of AgGaS 2 are found not to be affected by optical activity within the incidence angles of 10° for which, according to our symmetry considerations, the normal component of gyration tensor is small and evolution of light figures with wavelength is overwhelmingly determined by optical anisotropy. The absolute value of this anisotropy is falling down to null when passing through the isotropic point, with the result of a remarkable change of the parameters of light figure patterns. Unlike the case of AgGaS 2 and consistently with our symmetry considerations, light figures of TeO 2 are influenced by optical activity especially strongly in low orders of interference. The obtained results are compared with similar results for optically inactive CaCO 3 and discussed in the frameworks of our recent analyses.
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