Huygenian eyepiece
noun
Huy·ge·ni·an eyepiece
ˌhī-ˈgē-nē-ən-
ˌhȯi-
-ˈgen-ē-
: a compound eyepiece used especially with achromatic objectives that consists of two plano-convex lenses separated by a diaphragm with the convex sides facing the objective
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Merriam-Webster unabridged
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