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Relation between MUF and critical frequency is ______

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Relation between MUF and critical frequency is ______

(a) fc = fMUF secθi

(b) fMUF = fc sec^2 θi

(c) fc = fMUF sinθi

(d) fMUF = fc secθi

The question was asked in semester exam.

My question comes from Maximum Usable Frequency topic in portion Virtual Height, Critical Frequency and Muf of Antennas

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Right option is (d) fMUF = fc secθi

Easiest explanation: The fMUF in terms of critical frequency is given by fMUF = fc secθi for a given angle of incidence between two locations.

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