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Ramsden eyepiece

noun

, Optics.
  1. 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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Word History and Origins

Origin of Ramsden eyepiece1

1840–50; named after Jesse Ramsden (1735–1800), English maker of astronomical instruments

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