MCQEasy1 mark
1
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A ray of light is incident normally on a face of an equilateral prism. The ray gets totally reflected at the second refracting surface. The total deviation produced in the path of the ray is: (a) 30° (b) 60° (c) 90° (d) 120°
Topic: Total internal reflection in a prism
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Answer
Exam answer
(b) 60°.
Explanation
The ray enters normally, undergoes total internal reflection at the second face, and emerges normally from the third face. Total deviation is 60°.
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