Other Definitions
concave lens (dict)
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Concave LensA concave lens is a lens with inward-curving (concave) surfaces: the ends are wide, the middle is small. Light passing through a concave lens is diverged. Concave lenses can be used in telescopes, microscopes, and eyeglasses. In glasses, they are used to compensate for myopia (nearsightedness). Compare: convex lens
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