Convex lens
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Missing image
Large_convex_lens.jpg
Large_convex_lens.jpg
Convex lens converging light rays
A convex lens is a lens that is curved outward (convex): the ends are narrow and the middle is wide. Often referred to as a converging lens. Light passing through a convex lens is converged to a point. This point is also called a focal point. A Convex Lens can produce either a real or virtual image.
Compare: concave lens.
See also: M.C.Escher's artwork Convex and Concave. zh:凸透镜