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Question
The angle between an incident ray and the plane mirror is 30°. The total angle between the incident ray and reflected ray will be:
(a) 30°
(b) 60°
(c) 90°
(d) 120°
Solution
(b) 120o
Since, angle of incidence = 90o - angle between plane mirror and incident ray = 90o - 30o = 60o
and according to first law of reflection, angle of incidence = angle of reflection = 60o
Total angle between incident ray and reflected ray = 60o + 60o = 120o .
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