Question

A ray of light travels from a medium of refractive index $n_1$ to a medium of refractive index $n_2$. If angle of incidence is $i$ and angle of refraction sin $r$, then $\frac{\sin i}{\sin r}$ is equal to ________.

• A. $n_1$
• B. $n_2$
• C. $\frac{n_2}{n_1}$
• D. $\frac{n_1}{n_2}$

Answer 1

The correct option is C $\frac{n_2}{n_1}$

Refractive index, also called index of refraction, measure of the bending of a ray of light when passing from one medium into another. As per Snell's law and the given information,

$n_{1}sini$ = $n_{2}sinr$

$\therefore$ $\frac{sini}{sinr}$ = $\frac{n_2}{n_1}$