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Which of the following is used to increase the range of a telescope?

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in Physics – Class 12 by (135k points)
Which of the following is used to increase the range of a telescope?

(a) Increasing the focal length

(b) Decreasing the focal length

(c) Increasing the diameter of the objective

(d) Decreasing the diameter of the objective

This question was posed to me during an interview.

My question is from Optical Instruments in portion Ray Optics and Optical Instruments of Physics – Class 12

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Right answer is (c) Increasing the diameter of the objective

The explanation is: The light-gathering power of the objective will increase and even faint objects will become visible. This is done by increasing the diameter of the objective. So, by increasing the diameter of the objective, the range of the telescope can be increased.

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