Abstract
Values of the indices of refraction of selenite (CaSO4·2H2O) precise to five significant figures have been published by Tutton (1). For his measurements he used prisms with the crystal axes oriented so that the method of minimum deviation could be used. The birefringence obtained by taking differences between the indices of refraction so determined has a rather large uncertainty in the second significant figure and shows no consistent change with wavelength.
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