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JAMB Physics 2008 Question 37

Question 37

Lenses and Optical Instruments

An observer with normal eyes views an object with a magnifying glass of focal length 5 cm. The angular magnification is [least distance of distinct vision D = 25cm]

  1. A.−6.
  2. B.−5.
  3. C.5.
  4. D.6.
Show the answer and explanation

Answer: C (5.)

Explanation

For a relaxed normal eye (final image at infinity), angular magnification = D/f = 25 ÷ 5 = 5.