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JAMB Physics 1987 Question 37

Question 37

Lenses and Optical Instruments

Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?

  1. A.−5 mm
  2. B.+5 mm
  3. C.−5 cm
  4. D.+5 cm.
Show the answer and explanation

Answer: B (+5 mm)

Explanation

A microscope objective must be a converging lens (positive focal length) with a very short focal length, such as +5 mm.