In practice, the smallest angular size that one can resolve with a 10-inch telescope is governed by the:
A) blurring caused by the Earth's atmosphere
B) diffraction limit of the telescope
C) size of the primary mirror
D) motion of the night sky
E) magnification of the telescope

Question

Quizplus · Accepted Answer

The Earth's atmosphere causes blurring, known as "seeing," which typically limits the resolution of ground-based telescopes more than the diffraction limit.

In Practice, the Smallest Angular Size That One Can Resolve