Absolute index of refraction

see under .
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.
another name for refractive index
index of refraction
a measure of the extent to which a substance slows down light waves p-ssing through it. the index of refraction of a substance is equal to the ratio of the velocity of light in a vacuum to its speed in that substance. its value determines the extent to which light is refracted when entering or leaving the substance.

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