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Huygens’ eyepiece

Huy·gens' eye·piece [ hgənz  peess ] (plural Huy·gens' eye·piec·es)


noun 
Definition:
 
eyepiece consisting of two lenses: an eyepiece consisting of two plano-convex lenses with their flat sides toward the eye, fitted mainly on optical instruments that are used for observation rather than measurement

[Mid-19th century. After Christiaan Huygens (1629-1695), Dutch physicist and astronomer]
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