- 'rÉªËfrÃ¦k'tÉªvÉ™tÉª 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.
Look at other dictionaries:
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