In the diagram, the correctly marked angles are ______.
A
∠i and ∠r
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B
∠i and ∠e
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C
∠r and ∠e
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D
∠i, ∠r and ∠e
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Solution
The correct option is C∠i and ∠r All the angles should be taken from the normal to the ray. So in the figure only i and r angles are marked with the normal and hence correct.
Angle e is marked between the ray and the interface boundary so it is incorrect. Hence option (a) is the answer.