Medical Definition of Huygenian eyepiece
1.
An under corrected (blue rim at periphery of field) ocular designed by Huygens for the telescope and later adopted for achromatic objectives. This ocular consists of two plano-convex lenses separated by a diaphragm, hence it is of the negative type with the focal plane inside the system. Both plane surfaces face the eye, as distinguished from the Ramsden eyepiece.
(05 Aug 1998)
Lexicographical Neighbors of Huygenian Eyepiece
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