Ramsden eyepiece(redirected from Jesse Ramsden)
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Ramsden eyepieceSee eyepiece.
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.