If light enters a transparent medium at a right angle (perpendicular), what change occurs to the light?
A) Only its velocity is changed.
B) Only its direction is changed.
C) Both its direction and velocity are altered.
D) It is reflected rather than entering the medium.

Question

Quizplus · Accepted Answer

When light enters a transparent medium at a right angle to the surface, it continues straight without changing direction, but its velocity changes due to the difference in the optical density of the two media.

If Light Enters a Transparent Medium at a Right Angle