The light gathering capability of a telescope depends mainly on its
A) focal length.
B) eyepiece size.
C) length of the tube.
D) area of the primary lens or mirror.

Question

Quizplus · Accepted Answer

The light gathering capability of a telescope depends mainly on the area of the primary lens or mirror. A larger area collects more light, which results in brighter and more detailed images. Focal length, eyepiece size, and length of the tube affect other aspects of the telescope's performance, but not its light gathering ability.

The Light Gathering Capability of a Telescope Depends Mainly on Its