Lens
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This is the current revision of Lens as edited by (username removed) at 12:46, September 24, 2016. This URL is a permanent link to this version of this page.
A lens is a sheet of glass or similar transparent material of tapering thickness, which refracts light in order to magnify. Lenses are used in cameras, telescopes and microscopes, as well as in spectacles. Contact lenses are lenses placed directly against the human eye as an alternative to spectacles. The eye itself contains a lens which is used to focus.
