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Question
In the following ray diagram the correctly marked angle are:
(a) ∠i and ∠e
(b) ∠A and ∠D
(c) ∠i, ∠e and ∠D
(d) ∠r, ∠A and ∠D
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Solution
(d) ∠r, ∠A and ∠D
The angle between the normal and the incident ray is the angle of incidence.
The angle between the normal and the emergent ray is the angle of emergence.
The correctly marked angles are shown in the diagram below:
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Study the following figure in which a student has marked the angle of incidence (∠i), angle of refraction (∠r), angle of emergence (∠e), angle of prism (∠A) and the angle of deviation (∠D). The correctly marked angles are
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(b) ∠A, ∠i and ∠r
(c) ∠A, ∠i, ∠e and ∠D
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