A beam of light in air enters a glass slab with an index of refraction of 1.40 at an angle of incidence of 30.0°.What is the angle of refraction?
A)20.9°
B)47.5°
C)51.8°
D)30.0°
E)14.9°

Question

Quizplus · Accepted Answer

Using Snell's Law, n1 * sin(θ1) = n2 * sin(θ2), where n1 = 1 (air), θ1 = 30°, and n2 = 1.40 (glass). Solving for θ2 gives sin(θ2) = sin(30°)/1.40, which results in θ2 ≈ 20.9°.

A Beam of Light in Air Enters a Glass Slab