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For an elliptical mirror, calculates the radius of curvature, the conic constant and the distance from the mirror to the Weierstrass points as functions of the magnification and of the focal length. In the scheme, M is the object Weierstrass point and Mi is its conjugate. Fi is the focal point of the mirror (not to be confused with the foci of the ellise that are also the Weierstrass points).