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Indices of Refraction

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-459

2025-12-24

718

Indices of Refraction. Since the ether is the real medium for the transmission of light, and since the velocity is greater in ether alone (i.e., in a vacuum) than in ether associated with any kind of matter, there are two kinds of indices of refraction: one is the absolute index, shown when the ray passes from a vacuum into a substance; the other is the relative index, shown when the ray passes from one substance into another.

The relative index of two substances is found by taking the inverse ratio of their absolute indices. Approximately, the index of refraction for light passing from air to water is taken a 4/3; to crown glass,3/2; to flint glass, 8/5; and to diamond, 5/2.