An optical system that is diffraction-limited meets the Rayleigh criterion, or, put another way, can bring light to a focus at the theoretical minimum of the Airy disk. To be diffraction-limited there must be no more than ¼ wavelength of light between wavefronts at the focal point. Modern optical systems can exceed this theoretical design limit, but it remains a standard.
Related category OPTICS AND OPTICAL PHENOMENA
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