Which of the following features of a telescope determines its light-gathering power
A)the focal length of the primary lens
B)the focal length of the eyepiece
C)the diameter of the primary lens
D)length of the telescope tube
E)None of the other choices are correct.

Question

Quizplus · Accepted Answer

The diameter of the primary lens (or mirror in reflecting telescopes) determines the light-gathering power of a telescope. This is because a larger aperture collects more light, allowing fainter objects to be observed. The other choices do not significantly affect light-gathering power.

Which of the Following Features of a Telescope Determines Its