An engineer intends to deviate a light ray from... - JAMB Physics 2000 Question
An engineer intends to deviate a light ray from its path by 120o through reflection from a plane mirror. Calculate the angle of incidence
A
60o
B
40o
C
30o
D
20o
correct option: c
Angle of deviation = 180 - [i + v]
= 180 - 2i [since i = v]
∴ 120 = 180 - 2i
2i = 180 - 120
= 60
∴ i = 30o
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