Question

A ray of light traveling from air into crown glass strikes the surface at an angle of 30 degrees. What is the angle of refraction? (air n=1, crown glass n=1.532)
A)39.7 degrees
B)19.2 degrees
C)59.1 degrees
D)12.3 degrees
pls say the correct answer with steps pls

Answer 1

Given info : A ray of light travelling from air to crown glass strikes the surface at an angle 30°.

To find : the angle of refraction is ...

solution : refractive index of crown glass, μ = 1.532

From Snell's law,

    $\mu_1sin\theta_i=\mu_2sin\theta_r$

here, refractive index of air, $\mu_1$ = 1

refractive index of crown glass, $\mu_2$ = 1.532

angle of incidence, $\theta_i$ = 30°

angle of refraction, $\theta_r$ = ?

∴ 1sin30° = 1.532 sin$\theta_r$

⇒ 0.5/1.532 = sin$\theta_r$

⇒  sin$\theta_r$ = 0.3263 = 19.2°

therefore the angle of refraction is 19.2°.

Answer 2

Answer:

19.2

Explanation: