When light passes from air into a dense but transparent material such as glass, it
A) slows down.
B) maintains its speed, as required by the laws of physics.
C) changes its speed to that of sound in the medium.
D) speeds up.

Question

Quizplus · Accepted Answer

When light enters a denser medium like glass from a less dense medium like air, its speed decreases due to the optical density of the material. This is a fundamental principle of optics.

When Light Passes from Air into a Dense but Transparent