Physics · Optics - Telescopes
What are the primary advantages of using a parabolic mirror as an objective instead of a convex lens in a reflecting telescope?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It completely prevents any visual astigmatism and has a shorter focal length.
- 2It is free from chromatic aberration, eliminates spherical aberration, and is mechanically lighter to support at large apertures.✓
- 3It is significantly easier to manufacture and clean than a lens.
- 4It eliminates chromatic aberration and reduces spherical aberration completely.
Correct answer
It is free from chromatic aberration, eliminates spherical aberration, and is mechanically lighter to support at large apertures.
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