Which of the following features of a telescope determines its light-gathering power?
A) the focal length of the objective
B) the focal length of the eyepiece
C) the diameter of the objective
D) tength of the telescope tube
E) none of the above

Question

Quizplus · Accepted Answer

The diameter of the objective determines the light-gathering power of a telescope as it is responsible for collecting the incoming light. A larger diameter means more light can be collected and therefore better resolution and brightness. The focal length of the objective and eyepiece determine the magnification power of the telescope. The length of the telescope tube is not a determining factor for light-gathering power.

Which of the Following Features of a Telescope Determines Its