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JAMB Physics 1998 Question 30

Question 30

Light and Reflection

An object is placed in front of two plane mirrors inclined at an angle of θ°. If the total number of images formed is 7, find the value of θ.

  1. A.30°
  2. B.45°
  3. C.51°
  4. D.90°
Show the answer and explanation

Answer: B (45°)

Explanation

Number of images n = 360/θ − 1. 7 = 360/θ − 1 gives 360/θ = 8, so θ = 45°.