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In a Cassegrain feed system; the feed is placed at _____

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In a Cassegrain feed system; the feed is placed at _____

(a) Focus

(b) Vertex

(c) Directrix

(d) Anywhere between vertex and focus

This question was addressed to me in an interview for internship.

Asked question is from Feeding Systems in division Reflector Antenna of Antennas

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Correct answer is (b) Vertex

The best explanation: Cassegrain is a dual reflector antenna. In this the feed is placed at the vertex of the parabolic reflector. The focus of the sub-reflector coincides with the focus of parabolic reflector and it illuminates the reflector.

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