Which combination of optics is used in the Schmidt-Cassegrain telescope for producing high-quality wide-angle images of the sky?
A) single, short-focal-length spherical mirror
B) parabolic mirror of short focal length, used at prime focus
C) two lenses of different glass, one convex, the other concave, to reduce chromatic aberration
D) spherical primary mirror with a thin correcting lens ahead of it

Question

Quizplus · Accepted Answer

The Schmidt-Cassegrain telescope combines a spherical primary mirror with a thin correcting lens (Schmidt corrector plate) at the front of the telescope to correct for spherical aberration, allowing for high-quality, wide-angle images of the sky.

Which Combination of Optics Is Used in the Schmidt-Cassegrain Telescope