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Which of the following coincides with the focus of the parabolic reflector in a Cassegrain antenna?

Which of the following coincides with the focus of the parabolic reflector in a Cassegrain antenna? Correct Answer Focus of hyperboloid reflector

The focus of the sub-reflector coincides with the focus of parabolic reflector and it illuminates the reflector. Since it is a Cassegrain, the sub-reflector is a hyperboloid reflector.

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