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JAMB Physics 2008 Question 32

Question 32

Light and Reflection

An object of height 5cm is placed at 20 cm from a concave mirror of focal length 10 cm. The image height is

  1. A.20 cm.
  2. B.15 cm.
  3. C.10 cm.
  4. D.5 cm.
Show the answer and explanation

Answer: D (5 cm.)

Explanation

The object is at 2f (the centre of curvature), so the image is also at 20 cm, inverted and the same size: 5 cm high.