Light strikes a 5.0-cm thick sheet of glass at an angle of incidence in air of 50°. the sheet has parallel faces and the glass has an index of refraction 1.50. after traveling through the glass the light re-emerges into the air. what is the final angle of refraction in air?

Answer: sin (incidence) / sin (refraction) = n_refraction/n_incidence sin (50) / sin (x) = 1.5 / 1 sin (50) / 1.5 = sin (x) sin (x) = 0.511 x = 30.71o B] 50 degrees, same as the angle going in. You can show that by reversing the steps in A. sin (30.7) / sin (x) = 1/1.5 C] The glass is 5 cm thick. The reference angle = 30.7o Tan (30.7) = displacement / thickness Tan (30.7) = x / 5 5*sin (30.7) = x x = 2.97 cm which is the displacement.