Also found in: Dictionary, Thesaurus, Medical.
Ramsden eyepieceSee eyepiece.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
Ramsden eyepiece[′ramz·dən ′ī‚pēs]
An eyepiece consisting of two planoconvex lenses with their plane sides facing outward, having the same power and focal length, and separated by a distance equal to their common focal length.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.