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JAMB Physics 2001 Question 13

Question 13

Lenses and Optical Instruments

The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for

  1. A.improving the sharpness
  2. B.creating an inverted image
  3. C.magnification of the image
  4. D.erection of the image
Show the answer and explanation

Answer: D (erection of the image)

Explanation

An astronomical telescope gives an upside-down image. The extra (erecting) lens in a terrestrial telescope turns the image the right way up.