The angle of refraction of a ray of light traveling through a piece of flint glass is 24°. Find the angle of incidence.

Answer 1

n1 sin T1 = n2 sin T2

n1 = 1.000
n2 = 1.655

1.000 sin T1 = 1.655 sin 24

sin T1 = .673

T1 = 42.3 degrees

Answer 2

The critical angle of refraction for ray of light passing from flint glass to air is