Question

A light ray is traveling from air to glass. The angle of incidence on the boundary is 30${}^{\circ }$. Find the sine of the angle of refraction. (Take: $sin{30}^o=\frac{1}{2}$)

• A. 1/3
• B. 2
• C. 3
• D. 1

Answer 1

The correct option is A 1/3

Given:

The angle of incidence is $i={30}^o$

Refractive index of glass is $n_g=1.5$

Refractive index of air is $n_a=1$

The sine angle of refraction $sinr=?$

using Snell's law we can write, $n_a\times sini=n_g\times sinr$

$\therefore sinr=\frac{n_a\times sini}{n_g}=\frac{1\times sin3o^o}{1.5}=\frac{1}{3}$