make a perfect lens, there is still a limit to the resolution of an image created by such a lens. An optical system in which the resolution is no longer limited by imperfections in the lenses but only by diffraction is said to be diffraction limited.

Size

Far from the aperture, the angle at which the first minimum occurs, measured from the direction of incoming light, is given by the approximate formula:

or, for small angles, simply

where is in radians, is the wavelength

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