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JAMB Physics 1980 Question 36

Question 36

Lenses and Optical Instruments

In a compound microscope

  1. A.there is only one lens
  2. B.the objective lens has a shorter focal length than the eyepiece which is convex
  3. C.the objective lens has a longer focal length than the eyepiece which is convex
  4. D.the objective lens has a shorter focal length than the eyepiece which is concave
  5. E.the objective and the eyepiece are both convex and have the same focal lengths.
Show the answer and explanation

Answer: B (the objective lens has a shorter focal length than the eyepiece which is convex)

Explanation

A compound microscope has two converging (convex) lenses, and the objective has the shorter focal length.