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JAMB Physics 1982 Question 18

Question 18

Light and Reflection

An object 15 cm high is 30 cm from a pin-hole camera. If the height of the image formed at the back of the camera is 10 cm, the image distance is

  1. A.20 cm
  2. B.45 cm
  3. C.54 cm
  4. D.63 cm
  5. E.70 cm
Show the answer and explanation

Answer: A (20 cm)

Explanation

Image height/object height = image distance/object distance: 10/15 = v/30, so v = 20 cm.