Refraction - Definition, Refractive Index, Snell's Law
https://sciencenotes.org/refraction-definition-refractive-index-snells-law/
WEBOct 20, 2021 · 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. The index of refraction of light in water at 20 °C is 1.333. The index of refraction comparing wave speed to the speed of light in a vacuum is the absolute index of refraction.
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