Huygens eyepiece

noun

, Optics.

1. an eyepiece consisting of two plano-convex lenses, the plane sides of which both face the eye.

Huygens' eyepiece

/ ˈhaɪɡənz /

noun

1. 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 History and Origins

Origin of Huygens eyepiece¹

First recorded in 1830–40; named after C. Huygens

Word History and Origins

Origin of Huygens eyepiece¹

C19: named after Christiaan Huygens (1629–95), Dutch physicist

Example Sentences

The Huygens eyepiece consists of two plano-convex lenses whose focal lengths are in the ratio of three to one.

From Project Gutenberg