Snell's law: The ratio of sine of the angle of incidence to the sine of angle of refraction is constant for a pair of media. This constant is called the refractive index of the second medium w.r.t the first. it is generally represented by the greek letter $(\mu)$ $
\text { i.e } \mu=\frac{\sin \mathrm{i}}{\sin \mathrm{r}}
$
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