/ · 1894 Brewer’s · L · Lens (Latin, a lentil or bean)
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Glasses used in mathematical instruments are so called because the double convex one, which may be termed the perfect lens, is of a bean shape.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.
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