Question

A ray of light strikes a sheet of glass (n=1.5) at an angle of 25° with the normal. Find the angle of the refracted ray within the glass with respect to the normal. (a) 56° (b) 46° (c) 25° (d) 16° (e) 36°

Answer 1

Answer:

(d) 16°

Explanation:

Using Snell's law as:

$n_i\times {sin\theta_i}={n_r}\times{sin\theta_r}$

Where,  

${\theta_i}$  is the angle of incidence  ( 25.0° )

${\theta_r}$ is the angle of refraction  ( ? )

${n_r}$ is the refractive index of the refraction medium  (glass, n=1.5)

${n_i}$ is the refractive index of the incidence medium (air, n=1)

Hence,  

$1\times {sin25.0^0}={1.5}\times{sin\theta_r}$

Angle of refraction = $sin^{-1}0.2817$ = 16°