Spherical aberration can be corrected or avoided in a reflecting telescope by
A) grinding the mirror to a more accurate spherical curve.
B) grinding the mirror to a parabolic shape.
C) using light of only one color.
D) grinding the mirror to an elliptical shape.

Question

Quizplus · Accepted Answer

Spherical aberration occurs when light rays striking the outer edges of a spherical mirror focus at a different point than rays striking nearer the center. Grinding the mirror to a parabolic shape corrects this by ensuring all parallel incoming light rays focus at the same point, eliminating spherical aberration.

Spherical Aberration Can Be Corrected or Avoided in a Reflecting