a piece of glass or other transparent material with curved sides for concentrating or dispersing light rays, used singly (as in a magnifying glass) or with other lenses (as in a telescope). the light-gathering device of a camera, typically containing a group of compound lenses.
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a piece of glass or other transparent material with curved sides for concentrating or dispersing light rays, used singly (as in a magnifying glass) or with other lenses (as in a telescope).
the light-gathering device of a camera, typically containing a group of compound lenses.