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JAMB Physics 2014 Question 32

Question 32

Lenses and Optical Instruments

When a telescope is in normal use, the final image is at

  1. A.the focus.
  2. B.the radius of curvature.
  3. C.the near point.
  4. D.infinity.
Show the answer and explanation

Answer: D (infinity.)

Explanation

In normal adjustment the focal points of the objective and eyepiece coincide, so the final image is formed at infinity and the eye is relaxed.