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New 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 [[...
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.