object glass

  1. the lens or system of lenses in a telescope or microscope that is nearest the object being viewed
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How To Use object glass In A Sentence

  • The object glass of a telescope must be accurately centred.
  • The object glass is three inches; the focal length forty-three inches; and the telescope, when drawn out, with the pancratic eyepiece attached, is about four feet. Men of Invention and Industry
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