Multiple Choice
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
Correct Answer:
Verified
Correct Answer:
Verified
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