ALL meanings of index of refraction
in·dex of re·frac·tion
I i - noun index of refraction a number indicating the speed of light in a given medium as either the ratio of the speed of light in a vacuum to that in the given medium (absolute index of refraction) or the ratio of the speed of light in a specified medium to that in the given medium (relative index of refraction) Symbol: n. 1
- noun index of refraction the ratio of the sine of the angle of incidence to the sine of the angle of refraction for a ray of light crossing from one medium into another 0