FIELD: measuring equipment.
SUBSTANCE: device comprises a radiation source, a sample in the form of a parallel-sided plate, a device of detection of amount of displacement of the light beam, as well as an additional optical element with a known index of deflection and the geometrical dimensions, set with the test sample at the same incidence angle alternately in the sample holder, or together parallel to each other.
EFFECT: invention enables to improve the accuracy of measurement of the index of deflection of transparent solid materials of light gauge and small size.
4 dwg
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