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Unit of refractive power of a lens
Answer for the clue "Unit of refractive power of a lens ", 7 letters:
diopter
Alternative clues for the word diopter
Word definitions for diopter in dictionaries
WordNet
Word definitions in WordNet
n. a unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters
Wiktionary
Word definitions in Wiktionary
n. 1 A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. myopia is diagnosed and measured in diopters. 2 (context obsolete English) Any lens system, such as a telescope. 3 (context obsolete English) ...
The Collaborative International Dictionary
Word definitions in The Collaborative International Dictionary
Diopter \Di*op"ter\, ||Dioptra \Di*op"tra\, n. [L. dioptra, fr. Gr. ?. See 2d Dioptric .] An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc. [1913 Webster] ||
Wikipedia
Word definitions in Wikipedia
redirect Dioptre
Usage examples of diopter.
Magnus, distinguished by his smart outfit and grey hair, was setting up his elaborate diopter while more junior staff had to settle for the basic gro ma Some were responsible for raising twenty-foot-high marked posts that helped in taking levels, while others were awkwardly deploying a huge set square to mark a right angle for the initial setting-out of the intersection of the two wings of the new palace.
When he finally looks up, dark brown eyes stare out of the thicket through rimless plus-three diopters, giving him the look of a pugnacious sea otter.