Question

For the same angle of incidence, the angles of refraction in media P, Q and R are ${35}^0$, ${25}^0$, ${15}^0$ respectively. In which medium will the velocity of light be minimum?

Answer 1

$\eta$ = $\frac{c}{v}$ = $\frac{\sin i}{\sin r}$

$\Rightarrow$ v is directly proportional to r

Since r is minimum in medium R, therefore sin r is also minimum in medium R

Hence, velocity is minimum in medium R