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Huygens' eyepiece

(physics) a telescope eyepiece consisting of two planoconvex lenses separated by a distance equal to half the sum of their focal lengths, which are in the ratio of three to one, and oriented so that their curved surfaces face the incident light
Word Origin
C19: named after Christiaan Huygens (1629–95), Dutch physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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