| 单词 | optical device |
| 释义 | optical device (once / 319441 pages) n WORD FAMILY optical device: optical devices USAGE EXAMPLESThe two-speed effect is known as birefringence and it is used in many optical devices. Science Magazine(Nov 30, 2016) Eyedrops of several descriptions and optical devices accumulate as each is superseded by another. New York Times(Nov 17, 2016) The use of that optical device has led to some minor inaccuracies. The Guardian(Apr 22, 2016) n a device for producing or controlling light Hypo|Hyper autofocus an optical device for focussing a camera or other instrument automatically biprisman optical device for obtaining interference fringes camera lucidaan optical device consisting of an attachment that enables an observer to view simultaneously the image and a drawing surface for sketching it coelostatoptical device used to follow the path of a celestial body and reflect its light into a telescope; has a movable and a fixed mirror collimatoroptical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam diffraction grating, gratingoptical device consisting of a surface with many parallel grooves in it; disperses a beam of light (or other electromagnetic radiation) into its wavelengths to produce its spectrum diffuser, diffusoroptical device that distributes the light of a lamp evenly finder, view finder, viewfinderoptical device that helps a user to find the target of interest Kerr celloptical device consisting of a transparent cell with two electrodes between two polarizing media; passes light only if the two planes of polarization are parallel; used as a high-speed shutter or to modulate a laser beam laser, optical maseran acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light lens, lens system, lensea transparent optical device used to converge or diverge transmitted light and to form images Nicol prismoptical device that produces plane-polarized light planetariuman optical device for projecting images of celestial bodies and other astronomical phenomena onto the inner surface of a hemispherical dome polarimeter, polariscopean optical device used to measure the rotation of the plane of vibration of polarized light optical prism, prismoptical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image projectoran optical device for projecting a beam of light Rochon prism, Wollaston prismoptical device that produces plane-polarized ultraviolet light stereoscopean optical device for viewing stereoscopic photographs vieweran optical device for viewing photographic transparencies anastigmatcompound lens or lens system designed to be free of astigmatism and able to form approximately point images anastigmatic lensa lens designed to correct astigmatism camera lens, optical lensa lens that focuses the image in a camera compound lensa lens system consisting of two or more lenses on the same axis condenser, optical condenserlens used to concentrate light on an object contact, contact lensa thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication converging lens, convex lenslens such that a beam of light passing through it is brought to a point or focus crown lensa lens made of optical crown glass concave lens, diverging lensa lens such that a parallel beam of light passing through it is caused to diverge or spread out echelona diffraction grating consisting of a pile of plates of equal thickness arranged stepwise with a constant offset erecting prisma right-angled optical prism used to turn an inverted image upright eyepiece, ocularcombination of lenses at the viewing end of optical instruments field lensthe lens that is farthest from the eye in an optical device with more than one lens Fresnel lenslens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length intraocular lensan artificial lens that is implanted into the eye of someone to replace a damaged natural lens or someone who has had a cataract removed meniscus(optics) a lens that is concave on one side and convex on the other eyeglass, monoclelens for correcting defective vision in one eye; held in place by facial muscles object glass, object lens, objective, objective lensthe lens or system of lenses in a telescope or microscope that is nearest the object being viewed device an instrumentality invented for a particular purpose |
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