Post-UTME Physics 2017 Objective — Question 13

Question 13 of 20 from the Post-UTME Screening (Post-UTME) Physics 2017 Objective paper, with the correct answer and a full explanation.

Which of the following is NOT true of total internal reflection?

A. it occurs at all angles of incidence in the denser medium.Correct
B. It takes place when the angle of incidence in the denser medium is greater than the critical angle.
C. The reflected ray is intense and there is no refracted ray.
D. It occurs when the angle of incidence is 45 degrees in a glass air medium.

Explanation

Total internal reflection only occurs when the angle of incidence exceeds the critical angle, not at all angles of incidence, making this statement false.

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