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A multimode fiber optic end is conjugated by a lens with a plane circular source emitting in a given cone. The page calculates the minimum aperture diameter of the lens (so that the numerical aperture of the lens in the image space is equal to the numerical aperture of the fiber optic), the position of the fiber optic, the magnification and the coupling efficiency as functions of the diameter, position and half emission angle of the source, the focal length, the core diameter and numerical aperture of the fiber optic.