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 1The question was asked in my homework.This is a very interesting question from Parabolic Reflector Antenna topic in division Reflector Antenna of Antennas

What is the ratio of focal length to diameter for practical applicatio

1.	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 1The question was asked in my homework.This is a very interesting question from Parabolic Reflector Antenna topic in division Reflector Antenna of Antennas
Answer» The correct answer is (a) 0.25 to 0.5 Best EXPLANATION: The ratio of FOCAL length (f) to diameter (d) f/d < \(\frac{1}{4}\) indicates radiation away from the parabolic surface of the reflector.So for practical applications it LIES between 0.125 and 0.5.

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