What is the ratio of focal length to diameter for practical applicati – McqOptions

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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 1
Answer» B. < 0.25

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