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

(d) 16°

Step-by-step explanation:

Using Snell's law as:

`n_i* {sin\theta_i}={n_r}*{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* {sin25.0^0}={1.5}*{sin\theta_r}`

Angle of refraction =
`sin^(-1)0.2817` = 16°