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An engineer intends to deviate a light ray from its path by 120o through reflection...

Physics
JAMB 2000
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
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Correct Answer: Option C
Explanation
Angle of deviation = 180 - [i + v]
= 180 - 2i [since i = v]
∴ 120 = 180 - 2i
2i = 180 - 120
= 60
∴ i = 30o

There is an explanation video available below.

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Explanation Video

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