Discussion
How does the half power beamwidth of a uniformly illuminated aperture vary with its size?
Answer: D
Beamwidth in radians is approximately the wavelength divided by the aperture dimension, so doubling the aperture halves the beamwidth and quadruples the directivity, since the beam is narrowed in both planes. The relation is the practical reason radio telescopes and radars are built large. It is also why resolution at a given aperture improves with frequency, which drives millimetre wave imaging.
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