The light-gathering power of a telescope is related directly to the
A) image quality of its optics (resolution).
B) area of its primary mirror or lens.
C) focal length of its primary mirror or lens.
D) ratio of the focal lengths of its primary element (mirror or lens)and its eyepiece.

Question

Quizplus · Accepted Answer

The light-gathering power of a telescope is related directly to the area of its primary mirror or lens. The larger the aperture, the more light the telescope can collect and the brighter and clearer the objects observed through it will appear.

The Light-Gathering Power of a Telescope Is Related Directly to the