Discussion
Why is the surface accuracy of a reflector specified as a fraction of the wavelength?
Answer: B
A given physical bump produces a path error that is a larger fraction of a cycle at shorter wavelengths, so the same dish is excellent at one gigahertz and useless at one hundred. The usual criterion is a root mean square error below about one sixteenth of a wavelength. Thermal expansion is a cause of error rather than the reason for the units, ease of statement is not a physical argument, and feed illumination is a separate design variable.
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