Question

A ray of light passes from glass to air at an angle of 19.5 degree. calculate the angle og refraction given refractive index is 3/2

Answer 1

Refractive index=sin i/sin r
Sin r= sin i/refractive index
=19.5/3/2
=19.5×2/3
=5.9×2
=11.8

Answer 2

Given,

i = 19.5

r = ?

Refractive Index = 3/2

We know that,

According to Snell's law

$n = \frac{\sin i}{\sin r} \\ \\ 3/2 = \frac{sin 19.5}{\sin r} \\ \\ 3/2 = \frac{0.33}{sinr} \\ \\ \sin r = \frac{0.66}{3} \\ \\ \sin r = 0.22 \\ \\ r = 12.70$