from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to dioptrics.
- adj. Relating to optical refraction; refractive.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Pertaining to a diopter.
- adj. Acting as a medium for sight; making use of refraction (of lenses, etc.).
- adj. Capable of being seen through.
- n. The branch of optics concerned with refraction.
- n. A dioptric telescope.
from the GNU version of the Collaborative International Dictionary of English
- adj. Of or pertaining to the dioptre, or to the metric system of numbering glasses.
- adj. Of or pertaining to dioptrics; assisting vision by means of the refraction of light; refractive
from The Century Dictionary and Cyclopedia
- Affording a medium for the sight; assisting vision in the view of distant objects.
- Pertaining to dioptrics, or the science of refracted light.
- n. A unit of refractive power of a lens (or inverse focal length), equal to unity divided by a meter.
In a first-class 'dioptric' apparatus the light emanates from a lamp with several concentric wicks, the flame of which, being kindled by a very active draught, attains to great intensity.
It is true that the dioptric apparatus was perfected independently by Fresnel, who had also the satisfaction of being the first to put it into operation.
But it is indisputable that Brewster was earlier in the field than Fresnel; that he described the dioptric apparatus in 1812; that he pressed its adoption on those in authority at least as early as 1820, two years before Fresnel suggested it; and that it was finally introduced into
It is the most powerful oil light in the world, the flash being over 145,000 candle power emitted from a pair of dioptric lenses mounted on a mercury float revolving once every ten seconds.
The light is of the 4th order dioptric, showing a red arc of 270° to seaward, and a white arc of 90°, visible inside the breakwater and to the southward towards Alligator Creek.
After being fitted with two new 5th order dioptric lights -- which, being exhibited from the same lantern, show a powerful fixed light -- she was towed up in July to relieve the Channel Rock lightship, which had been thirteen years at her moorings.
The present lighthouse is 30 feet higher than Smeaton's, and is fitted with the modern system of dioptric refractors, giving a light of
But Sir Isaac has shown that dioptric telescopes cannot be brought to a greater perfection, because of that refraction, and of that very refrangibility, which at the same time that they bring objects nearer to us, scatter too much the elementary rays.
In fishes and reptiles, as Owen has remarked, the range of gradations of dioptric structures is very great.
Since then, several more dioptric lights have been sent to the same region, and also to