## convex
convexus for "vaulted." A biconvex
lens has two convex surfaces, not necessarily with the same radii
of curvature.A figure, such as a polygon or a polyhedron, is said to be convex if every line segment that joins two interior points remains inside the figure. Similarly, a set is convex if it contains all the line segments connecting any pair of its points. Compare with concave. ## Related categories• OPTICS AND OPTICAL PHENOMENA• MATHEMATICAL TERMINOLOGY | |||||||

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