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lens
A clear optical element that produces an image by refraction. A convex lens makes light rays converge at a focal point, while a concave lens causes rays to diverge. A thinner lens has a longer focal length than a thicker one, and is also easier to make and suffers less from chromatic aberration and other distortions. In practice, however, combinations of lenses are used to overcome these problems.
Related category
• OPTICS AND OPTICAL PHENOMENA
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