noun
a lens system consisting of two or more lenses on the same axis
• Hypernyms: ↑lens, ↑lense, ↑lens system
• Hyponyms: ↑achromatic lens
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noun : a lens made of simple lenses mounted on a common axis usually in close juxtaposition and often cemented together — see achromatic lens
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an optical system consisting of two or more lenses having the same axis.
Useful english dictionary. 2012.