Question

Which is one advantage of using a reflecting telescope instead of a refracting telescope?

Reflecting telescopes are less expensive.
Reflecting telescopes produce clearer images.
Reflecting telescopes require only concave lenses.
Reflecting telescopes usually take up less space.

Answer 1

Reflecting telescopes are less expensive.

Explanation: Mirrors are cheaper and easier to make/support at large apertures than large lenses, and mirrors avoid chromatic aberration—so reflectors give a cost and performance advantage over refractors.