Discussion
What is a Cassegrain reflector arrangement?
Answer: C
The Cassegrain uses a hyperboloidal subreflector to fold the path so the feed can sit at the vertex of the main dish rather than at its focus, which shortens the feed run, keeps the receiver accessible and allows a longer effective focal length. Prime focus is the direct arrangement, the paired paraboloid describes a beam waveguide differently, and the corrector plate belongs to Schmidt optics. Folding an optical path to place equipment conveniently is an idea borrowed directly from telescope design.
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