Question

A ray of light is incident at an angle ${50}^0$ with the surface of glass of refractive index 1.5. Find the deviation of ray when it enters glass.

Answer 1

Using Snell,s law$\mu =\frac{\sin i}{\sin r}$

$\sin r=\frac{\sin {50}^0}{1.5}$

$\Rightarrow r=si{n}^{-1}0.51={30.66}^0$

$\Rightarrow Deviation=i-r=50-30.66={19.34}^0$