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How does the magnifying power of a telescope change on increasing the diameter of its objective?

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in Physics – Class 12 by (135k points)
How does the magnifying power of a telescope change on increasing the diameter of its objective?

(a) Independent

(b) Doubled

(c) Halved

(d) Becomes zero

This question was posed to me in an interview for internship.

This key question is from Optical Instruments in section Ray Optics and Optical Instruments of Physics – Class 12

1 Answer

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Best answer
The correct answer is (a) Independent

Best explanation: Magnifying power of a telescope is given as:

m = \(\frac {f_0}{f_e}\)

It is independent of the aperture of the object. So the magnifying power is not affected when the diameter of the objective is increased.

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