Huygens' eyepiece


Huygens' eyepiece

(ˈhaɪɡənz) n (General Physics) 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[C19: named after Christiaan Huygens ]