When a light ray in air or a vacuum hits the surface of a piece of perfectly smooth, flat glass at an angle and enters the glass, it will
A) reverse its direction and return along its original path.
B) bend toward the perpendicular to the surface.
C) bend away from the perpendicular to the surface.
D) not change its direction at all.

Question

Quizplus · Accepted Answer

When a light ray moves from a less dense medium (air or vacuum) to a denser medium (glass), it bends toward the perpendicular to the surface. This phenomenon is described by Snell's Law of refraction.

When a Light Ray in Air or a Vacuum Hits