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JAMB Physics 2000 Question 14

Question 14

Light and Reflection

An engineer intends to deviate a light ray from its path by 120° through reflection from a plane mirror. Calculate the angle of incidence.

  1. A.20°
  2. B.30°
  3. C.40°
  4. D.60°
Show the answer and explanation

Answer: B (30°)

Explanation

Deviation by a plane mirror = 180° − 2i. So 180 − 2i = 120 and i = 30°.