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JAMB Physics 2000 Question 34

Question 34

Lenses and Optical Instruments

A projection lantern is used to give the image of a slide on a screen. If the image is 24 times as large as the slide and the screen is 72.0 m from the projecting lens, what is the position of the slide from the lens?

  1. A.4.0 m
  2. B.3.5 m
  3. C.3.0 m
  4. D.0.3 m
Show the answer and explanation

Answer: C (3.0 m)

Explanation

Magnification = v/u, so 24 = 72/u and u = 3.0 m.