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JAMB Physics 1989 Question 25

Question 25

Lenses and Optical Instruments

An object is placed 5.6 × 10−4 m in front of a converging lens of focal length 1.0 × 10−3 m. The image formed is

  1. A.real, erect and magnified
  2. B.virtual, erect and magnified
  3. C.real, inverted and magnified
  4. D.virtual, erect and dimished.
Show the answer and explanation

Answer: B (virtual, erect and magnified)

Explanation

The object is closer to the lens than its focal length, so the lens acts as a magnifying glass: the image is virtual, upright and magnified.