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concave lens

   Also found in: Dictionary/thesaurus, Encyclopedia, Wikipedia, Hutchinson 0.03 sec.
concave lens
n.
A lens having at least one surface curved like the inner surface of a sphere.
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Canon engineers achieved the high magnification of 15x/18x, as well as the compact optical system length by incorporating four elements in three groups and strategically positioning a concave lens within the objective lens section.
Canon Expands Line of Binoculars With Introduction of 15x50IS and ... by Business Wire
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