Ramsden eyepiece
noun Optics.
an eyepiece consisting of two plano-convex crown-glass lenses of equal focal length, placed with the convex sides facing each other and with a separation between the lenses of about two-thirds of the focal length of each.
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Origin of Ramsden eyepiece
1840–50; named after Jesse Ramsden (1735–1800), English maker of astronomical instruments
Words nearby Ramsden eyepiece
Rampur, ram raid, ramrod, Ramsay, Ramsay Hunt's syndrome, Ramsden eyepiece, Ramses, Ramses I, Ramses II, Ramses III, Ramsey
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020