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What is the meaning of OPTICAL. Phrases containing OPTICAL
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OPTICAL
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Acronyms & AI meanings
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n.
The eyepiece of an optical instrument, as of a telescope or microscope.
n.
The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.
n.
An optical toy similar to the phenakistoscope. See Phenakistoscope.
n.
An optical instrument consisting of two lenses set in a light frame, and worn to assist sight, to obviate some defect in the organs of vision, or to shield the eyes from bright light.
n.
An optical toy, in which figures made to revolve on the inside of a cylinder, and viewed through slits in its circumference, appear like a single figure passing through a series of natural motions as if animated or mechanically moved.
n.
An optical instrument for forming and examining spectra (as that of solar light, or those produced by flames in which different substances are volatilized), so as to determine, from the position of the spectral lines, the composition of the substance.
a.
Relating to the science of optics; as, optical works.
a.
One who deals in optical glasses and instruments.
n.
An optical instrument used in viewing distant objects, as the heavenly bodies.
a.
Of or pertaining to an optical arrangement for forming images in a darkened room, usually called scioptic ball.
a.
Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of Brain, and Eye.
n.
An optical instrument used in determining the position of the planes of light-vibration in sections of crystals.
n.
An optical glass that is convex on both sides.
n.
An optical instrument or toy for showing the presistence of an impression upon the eyes after the luminous object is withdrawn.
n.
An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, so as to appear as one to the observer.
n.
An instrument for measuring angular distances between objects, -- used esp. at sea, for ascertaining the latitude and longitude. It is constructed on the same optical principle as Hadley's quadrant, but usually of metal, with a nicer graduation, telescopic sight, and its arc the sixth, and sometimes the third, part of a circle. See Quadrant.
adv.
By optics or sight; with reference to optics.
a.
Alt. of Optical
n.
An optical apparatus in which pictures are viewed through a large lens with stereoptical effects. It is often combined with the stereoscope.
a.
Of or pertaining to vision or sight.
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