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 is r, then $\frac{sini}{sinr}$ is equal to _______.

• A. $n_1$
• B. $n_2$
• C. $n_2$/$n_1$
• D. $n_1$/$n_2$

Answer 1

Answer: (C)

$n_2$/$n_1$

Using Snell's law of refraction when a ray of light travels from a medium having refractive index $n_1$ to another medium having refractive index $n_2$.
$n_1\times \sin i=n_2\times \sin r$
$⟹\frac{\sin i}{\sin r}=\frac{n_2}{n_1}$