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In which of the following secondary reflector is convex?

In which of the following secondary reflector is convex? Correct Answer Cassegrain

Dual reflector antennas have both primary and secondary reflectors. Cassegrain and Gregorian antennas are dual reflector antennas. Secondary reflector is convex for Cassegrain antenna. In Gregorian concave ellipsoidal is used as secondary reflector. Parabolic and corner antennas are normal reflector antennas.

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