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JAMB Physics 1992 Question 27

Question 27

Lenses and Optical Instruments

Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?

  1. A.He cannot see distant objects clearly
  2. B.Rays of light from a close object are focused in front of his retina
  3. C.His eyeball is too long
  4. D.Parallel rays of light are focused behind his retina.
Show the answer and explanation

Answer: D (Parallel rays of light are focused behind his retina.)

Explanation

A long-sighted eye is too short (or its lens too weak), so with the eye relaxed even parallel rays would meet behind the retina; near objects are the ones he cannot see clearly.