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Surely lens is combination of concave/convext surfaces. A lune is convex/convex, and a zero area lune results from two circles of equal radius. A regular lens comes from the intersection of two circles of equal radius. A zero area lune and zero area lens are the same thing. — Preceding unsigned comment added by 81.86.104.165 (talk) 09:13, 18 March 2014 (UTC)[reply]
