Two standards for testing resolution are the Rayleigh criterion and the Dawes limit. Both were developed before modern advances in lens coating, glass formulation, and improved optical precision figuring and design, not to mention, such innovations as active optics and interferometry. A related concept is spectral (or frequency) resolution, which is the ability of a telescope to differentiate two light signals that differ in frequency by a small amount. The closer the two signals are in frequency while still allowing the telescope to separate them as two distinct components, the greater the spectral resolution of the instrument.
Related category OPTICS AND OPTICAL PHENOMENA
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