positive eyepiece definition

  • noun:
    • an eyepiece composed of two plano-convex contacts placed along with their curved surfaces toward one another, and divided by a distance notably lower than the focal length of this one nearest eye, the picture associated with the item viewed becoming beyond both contacts; -- called additionally, through the name associated with inventor, Ramsden's eyepiece.
  • adjective:
    • See under Eyepiece.
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