High Quality Content by WIKIPEDIA articles! In geometry, a lens is a convex shape comprising two circular arcs, joined at their endpoints. If the arcs have equal radii, it is called a symmetric lens. The corresponding concave shape is the lune. The Vesica piscis is one form of a symmetrical lens; the term is also used for lenses generally. In common usage, the term "lens" is also used to describe the shape of a three-dimensional object obtained by rotating a two-dimensional lens about its narrow axis of symmetry. Such a shape is described as lenticular.

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