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For a given gaussian laser beam injected in a multimode fiber optic with a system made of two lenses, calculates the fiber entrance position and the coupling efficiency as functions of the wavelength, the incident beam waist position and radius, the M square factor, the focal lengths, the diameter and numerical aperture of the fiber optic and its entrance facet transmission. The fiber entrance is supposed to be located on the waist of the transmitted beam. For this reason, the calculation is not processed if the waist of the transmitted beam is "virtual" and not "real"