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JAMB Physics 2003 Question 16

Question 16

Lenses and Optical Instruments

By what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen on a screen placed 25cm from the lens?

  1. A.15.0
  2. B.2.5
  3. C.1.5
  4. D.0.4
Show the answer and explanation

Answer: B (2.5)

Explanation

Magnification = v/u = 25/10 = 2.5.