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Which of the following combination forms a Cassegrain antenna?

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Which of the following combination forms a Cassegrain antenna?

(a) The main reflector is parabolic and sub-reflector is hyperbolic

(b) The main reflector is parabolic and sub-reflector is concave

(c) The main reflector is hyperbolic and sub-reflector is parabolic

(d) The main reflector is hyperbolic and sub-reflector is convex

This question was addressed to me during an interview.

I'd like to ask this question from Basics in chapter Reflector Antenna of Antennas

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Right option is (a) The main reflector is parabolic and sub-reflector is hyperbolic

Explanation: A Cassegrain antenna is a dual reflector antenna and is axis symmetry. It consists of two reflectors and one primary feed. The main reflector is parabolic and sub-reflector is hyperbolic (convex).

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