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JAMB Physics 1984 Question 31

Question 31

Lenses and Optical Instruments

Which of the following statements about the compound microscope and astronomical telescope is (are) correct? I. The final image of a compound microscope is located at infinity. II. The final image of the astronomical telescope is always erect. III. The objective lens of a compound microscope has a very short focal length.

  1. A.I only
  2. B.II only
  3. C.III only
  4. D.I and III
  5. E.II and III.
Show the answer and explanation

Answer: C (III only)

Explanation

A compound microscope's objective has a very short focal length and its final image is usually at the near point. An astronomical telescope gives an inverted image.