For the first time, the optical properties of a nematic liquid crystal doped by chiral molecules of 7-dehydrocholesterol (7-DHC, provitamin D3) are studied by Stokes-polarimetry. 7-DHC undergoes photochemical transformations under UV irradiation. The relation between the ellipticity of passed light and the cholesteric pitch is calculated for the case of linearly polarized incident light and the fixed thickness of a planar liquid crystal layer. The change of the spiral wave vector sign under UV irradiation is experimentally found. The correlation of the sign change with the photoinduced formation of trans-isomer tachysterol is shown.

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