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Question
A ray of light strikes a plane mirror such that its angle of incidence is 30°. What angle does the reflected ray make with the mirror surface?
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Solution
The reflected ray makes an angle of 60o with the mirror surface because:
angle of incidence = angle of reflection = 30o, and
angle of the reflected ray with the mirror surface = 90o - angle of reflection = 90o - 30o = 60o
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