Wiktionary

Coddington magnifier

English edit

 
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Etymology edit

Popularized and refined by Henry Coddington.

Noun edit

Coddington magnifier (plural Coddington magnifiers)

  1. A magnifying glass consisting of a single thick lens with a central deep groove diaphragm at the equator, limiting the rays to those close to the axis and minimizing spherical aberration.
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