The critical angle for a transparent material is the angle at and beyond which all light within the material at its upper surface is
A)refracted.
B)reflected.
C)absorbed.
D)dispersed.
E)diffused.

Question

Quizplus · Accepted Answer

The critical angle is the angle of incidence that results in an angle of refraction of 90 degrees. If the angle of incidence is greater than the critical angle, total internal reflection occurs, and all the light is reflected back into the material rather than being refracted out of it. Therefore, the correct answer is B) reflected.

The Critical Angle for a Transparent Material Is the Angle