Question

Where's a reflecting telescope uses ___ to gather light a refracting telescope uses ___

A. a lens; a curved mirror
B. a curved mirror; a lens
C. prime focus; focal length
D. focal length; prime focus

Answer 1

The answer should be B. Because reflecting telescopes used curved mirrors (mirrors reflect light), whereas refracting ones' use lenses (lenses focus or scatter light, called refraction).