What is the ratio of focal length to diameter for practical applications in a parabolic reflector?
(a) 0.25 to 0.5
(b) < 0.25
(c) 0.125 to 0.3
(d) 0.5 to 1
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This is a very interesting question from Parabolic Reflector Antenna topic in division Reflector Antenna of Antennas