Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?
A) Lenses absorb light, while mirrors do not.
B) Lenses are subject to chromatic aberration.
C) Heavy lenses, which can only be supported at their edges, tend to deform under their own weight.
D) A lens must have two precision surfaces; a mirror needs only one.
E) Lenses are harder to focus than mirrors.

Question

Quizplus · Accepted Answer

Reflecting telescopes use mirrors to focus light, which avoids chromatic aberration and can support larger apertures without the deformation issues of heavy lenses. Both lenses and mirrors require precise focusing, so the difficulty in focusing is not a distinguishing factor between the two.

Which of the Following Is NOT a Reason to Use