# Lensmaker's Equation

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The lensmaker's equation relates the focal length of a simple lens with the spherical curvature of its two faces: , where and represent the radii of curvature of the lens surfaces closest to the light source (on the left) and the object (on the right). The sign of is determined by the location of the center of curvature along the optic axis, with the origin at the center of the lens. Thus for a doubly convex lens, is positive while is negative.

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Contributed by: S. M. Blinder (March 2011)

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