What is the resolution of an optical device? What does it depend on?

RESOLUTION CAPABILITY (resolving power) of optical devices is a value characterizing the ability of these devices to give a separate image of two points of an object that are close to each other. The resolution of any optical device is evaluated by its hardware functions, reflecting all the factors that affect the quality of the image provided by this device. Such influencing factors, of course, should include, first of all, aberration and diffraction — bending by obstacles by light waves and, as a consequence, their deviation from the straight line direction.

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