Refraction – Definition, Refractive Index, Snell’s Law
https://sciencenotes.org/refraction-definition-refractive-index-snells-law/
WEBOct 20, 2021 · The index of refraction (also called the refractive index) is a dimensionless number that compares the speed of light in a vacuum to its speed in a given medium (its phase velocity): n = c / v. Here, n is the index of refraction, c is the speed of light in a vacuum, and v is the phase velocity. So, the index of refraction in a vacuum is 1.
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