JAMB Physics 2019 Objective — Question 9

Question 9 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2019 Objective paper, with the correct answer and a full explanation.

The angle of incidence in the denser medium when the angle of refraction in the less dense medium is 90° is called

A. critical angleCorrect
B. refracted angle
C. optical angle
D. emergent angle

Explanation

This defines the critical angle — the angle of incidence in the denser medium beyond which total internal reflection occurs.

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