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JAMB Physics 1988 Question 31

Question 31

Light and Reflection

In the figure above, what is the angle of reflection of the ray of light at mirror M2?

Diagram for this question
  1. A.90°
  2. B.60°
  3. C.45°
  4. D.30°
Show the answer and explanation

Answer: B (60°)

Explanation

The ray strikes M1 at 30° to its normal and leaves at 30° below the horizontal. M2 is horizontal, so the ray meets it at 60° to its (vertical) normal and reflects at 60°.