Double Convex Lens

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“The double convex lens may be described as the part common to two spheres that intersect each other. The centers of the limiting spherical surfaces, as c and C, are the centers of curvature. The straight line, XY, passing through the centers of curvature is the principal axis of the lens.” -Avery 1895


Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 357


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