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    Related: Optics, Convex lense
    Refractive Mgmt/Intervention

    Image formation for an object at infinite distance (such as a star) by a simple convex lens. The distance from the lens to the image is f, the focal length of the lens; the power of the lens is given by P = 1/f, where P is given units of diopters (D), equivalent to reciprocal meters.