Lesson: Chapter 5 — Optics

5.3.2. Total internal reflection and the critical angle 1 of 5 Reset answers

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Question 1

What is the critical angle?

A The angle of incidence in the denser medium for which the angle of refraction is 90° B The angle at which light is absorbed C Any angle greater than 45° D The angle of reflection at a mirror

The right answer is the one marked above.

The angle of incidence in the denser medium for which the angle of refraction is 90°. At that angle the refracted ray runs along the boundary.

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