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Q. The magnifying power of an astronomical telescope can be decreased by

  • (A) decreasing the focal length of the eyepiece
  • (B) increasing the focal length of the goal
  • (C) increasing the focal length of the eyepiece
  • (D) None of these
  • Correct Answer - Option(C)
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Explanation by: Admin
The magnifying power (M) of an astronomical telescope is given by the formula:

M = F0 / Fe

where:

= Focal length of the objective lens

= Focal length of the eyepiece


To decrease magnification, we need to increase (the focal length of the eyepiece), as it is in the denominator of the formula.

Other Options Explained:

(A) Decreasing the focal length of the eyepiece → Increases magnification.

(B) Increasing the focal length of the objective → Increases magnification.

(D) None of these → Incorrect, as option (C) is correct.


Thus, the correct answer is (C) Increasing the focal length of the eyepiece.

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