Question

A Ray of light travelling in air strikes a glass slab at an angle of 30 degree calculate the angle of refraction if refractive index of Glass is 1.5

Answer 1

$sin \: i \: = {30}^{0}$
$refractive \: index \: = 1.5$
$ref \: index \: = \frac{sin \: i}{sin \: r}$
$sin \: r = \frac{1}{3}$

Answer 2

A/Q to snell's law

µ1 sinΘ1=µ2 sinΘ2

sin30=1.5 sinΘ2                   µ1=1 (for air)

(0.5/1.5)=sinΘ2

0.333=sinΘ2

therefore sinΘ2=19.8

or Θ2= sin^(-1)1/3