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Parameters

fi: effective focal length of the achromat
vd1: constringence of the first lens
vd2: constringence of the second lens
fi1: average effective focal length of the first lens ( distance from the lens to the back focal point at a wavelength 587.56 nm )
fi2: average effective focal length of the second lens ( distance from the lens to the back focal point at a wavelength of 587.56 nm )