Question

the light - gathering power of a telescope is determined by its aperture.

Explanation:

The light - gathering power of a telescope is directly related to the area of its aperture. A larger aperture (larger diameter) allows more light to enter the telescope. Since the area of a circular aperture (which is common) is \(A=\pi r^{2}=\frac{\pi d^{2}}{4}\) (where \(d\) is the diameter), the aperture size (diameter or radius) determines the amount of light it can gather.

Answer:

TRUE