A ray of light travel?

Question

a ray of light traveling through air is incident upon a sheet of crown glass at an angle of 30 degree, what is the angle of refraction?

Answer 1

You will need the index of refraction of the glass.  Then use Snell's law.

Answer 2

The index of refraction in crown glass = 1.520

Using snell's law

n(1) sin(θ(1)) = n(2) sin(θ(2))

1*sin(30°) = 1.520 sin(θ(2))

sin(θ(2)) = 1.5 \ 1.520 = 0.3289474

Using calculator

θ(2) = 19° 12' 17.63''