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JAMB Physics 2000 Question 31

Question 31

Lenses and Optical Instruments

What optical instrument can best be constructed with converging lenses of focal lengths 50 cm and 5 cm?

  1. A.Compound microscope
  2. B.Terrestrial telescope
  3. C.Astronomical telescope
  4. D.Galileo's telescope
Show the answer and explanation

Answer: C (Astronomical telescope)

Explanation

An astronomical telescope uses two converging lenses: a long-focus objective (50 cm) and a short-focus eyepiece (5 cm). A Galilean telescope needs a diverging eyepiece.