- The incident ray
**i,**the refracted ray**r**and the normal**N**for the given surface at a point of incidence lies in the same plane - For any pair of medium, the sine angle of incidence
**i**to the sine angle of refraction**r**ratio is constant**($\mu$)**.

**Snell's law formula** for the given pair of media is given by

Where, $\mu$ is the refractive index value of second medium with respect to first called as

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Given: Incident angle i = 20

The refracted angle is given by

$\frac{sin\ i}{sin\ r}$ = $\mu$

$\frac{sin\ 20}{sin\ r}$ = 1.4

sin r = $\frac{0.34}{1.4}$

r = sin

r = 14

Given: Refracted angle r = 32

The refracted angle is given by

$\frac{sin\ i}{sin\ r}$ = $\mu$

$\frac{sin\ i}{sin\ 32}$ = 0.8

sin i = 0.8 $\times$ 0.5299

i = sin

i = 25

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