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In which of the following the secondary reflector faces the primary reflector?

In which of the following the secondary reflector faces the primary reflector? Correct Answer Gregorian

In Gregorian antenna, sub-reflector is ellipsoidal and has its concave side faces the primary reflector. In Cassegrain, sub-reflector is hyperboloid with its convex side facing the feed. Corner and plane reflectors are normal reflector antennas while Cassegrain and Gregorian are dual reflector antennas.

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