Lens (geometry)
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A lens contained between two circular arcs of radius R, and centers at O1 and O2
In geometry, a lens is a biconvex shape comprising two circular arcs, joined at their endpoints. If the arcs have equal radii, it is called a symmetric lens. A concave-convex shape is called a 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.
[edit] See also
[edit] References
- Eric W. Weisstein.. "Lens". MathWorld. http://mathworld.wolfram.com/Lens.html. Retrieved June 13, 2005. which in turn cites
- Pedoe, D. (1995). "Circles: A Mathematical View, rev. ed.". Washington, DC: Math. Assoc. Amer..
- Plummer, H. (1960). An Introductory Treatise of Dynamical Astronomy. York: Dover.
- Rawles, B. (1997). Sacred Geometry Design Sourcebook: Universal Dimensional Patterns.. Eagle Point, OR: Elysian Pub.. http://www.GeometryCode.com/sg. page 11
- Watson, G. N. (1966). A Treatise on the Theory of Bessel Functions, 2nd ed.. Cambridge, England: Cambridge University Press.
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