dioptric

Also di·op·tri·cal

[dahy-op-trik]

adjective

1. Optics.,  pertaining to dioptrics.

   dioptric images.

2. Optics, Ophthalmology.,  noting or pertaining to refraction or refracted light.

dioptric

/ daɪˈɒptrɪk /

adjective

1. of or concerned with dioptrics

2. of or denoting refraction or refracted light

dioptric

1. Relating to the refraction of light, especially by a lens. Dioptric lenses are used in Fresnel lenses and camera viewfinders.

2. Compare catadioptric catoptric

Other Word Forms

• dioptrically adverb

Word History and Origins

Origin of dioptric¹

From the Greek word dioptrikós, dating back to 1625–35. See diopter, -ic

Example Sentences

Ramsden’s dioptric micrometer consists of a divided lens placed in the conjugate focus of the innermost lens of the erecting eye-tube of a terrestrial telescope.

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The light is of the dioptric kind—bright, steady, and uniform, and when the weather is too foggy to allow it to be seen, a bell is tolled by machinery, to give the needful warning.

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A dioptric telescope, fitted with two tubes joining, so as to enable a person to view an object with both eyes at once; a doubleÏbarreled field glass or an opera glass.

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During his residence in Birmingham, Messrs Chance being makers of glass for use in lighthouse lamps, his attention was naturally turned to problems of lighthouse illumination, and he was able to devise improvements in both the catoptric and dioptric methods for concentrating and directing the beam.

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Holophote, hol′o-fōt, n. an improved optical apparatus now used in lighthouses, by which all the light from the lamp is thrown in the required direction, in the catoptric holophote by reflectors, in the dioptric by refracting lenses, in the catadioptric by both combined.—adj.

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