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JAMB Physics 1999 Question 31

Question 31

Lenses and Optical Instruments

An astronomical telescope is said to be in normal adjustment when the

  1. A.eye is accomodated
  2. B.focal length of objective lens is longer than that of eye piece
  3. C.final image is at the near point of eye
  4. D.final image is at infinity.
Show the answer and explanation

Answer: D (final image is at infinity.)

Explanation

In normal adjustment the final image is formed at infinity, so the eye views it relaxed.