refractivities


refractivities
'rɪːfræk'tɪvətɪ n. quality of causing refraction, quality of causing rays of light or energy to bend as they pass from one medium into another

English contemporary dictionary. 2014.

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  • Refractive index — Refraction of light at the interface between two media. In optics the refractive index or index of refraction of a substance or medium is a measure of the speed of light in that medium. It is expressed as a ratio of the speed of light in vacuum… …   Wikipedia