Index of refraction

What is Index of refraction?

Index of refraction definition and meaning on Dictionary terms:
noun Optics.
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

 

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