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Anorthoscope :: Anorthoscope (n.) An optical toy for producing amusing figures or pictures by means of two revolving disks, on one of which distorted figures are painted..

Synoptic :: Synoptical (a.) Affording a general view of the whole, or of the principal parts of a thing; as, a synoptic table; a synoptical statement of an argument..

Autoptical :: Autoptical (a.) Seen with one's own eyes; belonging to, or connected with, personal observation; as, autoptic testimony or experience..

Stop :: Stop (n.) The diaphragm used in optical instruments to cut off the marginal portions of a beam of light passing through lenses.

Aperture :: Aperture (n.) The diameter of the exposed part of the object glass of a telescope or other optical instrument; as, a telescope of four-inch aperture..

Optically :: Optically (adv.) By optics or sight; with reference to optics.

Glass :: Glass (v. t.) An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses..

Phoneidoscope :: Phoneidoscope (n.) An instrument for studying the motions of sounding bodies by optical means. It consists of a tube across the end of which is stretched a film of soap solution thin enough to give colored bands, the form and position of which are affected by sonorous vibrations..

Stereoscopic :: Stereoscope (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..

Sextant :: Sextant (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..

Phantascope :: Phantascope (n.) An optical instrument or toy, resembling the phenakistoscope, and illustrating the same principle; -- called also phantasmascope..

Periscope :: Periscope (n.) an optical instrument of tubular shape containing an arrangement of lenses and mirrors (or prisms), allowing a person to observe a field of view otherwise obstructed, as beyond an obstructing object or (as in submarines) above the surface of the water..

Illuminator :: Illuminator (v. t.) A condenser or reflector of light in optical apparatus; also, an illuminant..

Phantasm :: Phantasm (n.) An image formed by the mind, and supposed to be real or material; a shadowy or airy appearance; sometimes, an optical illusion; a phantom; a dream..

Inactive :: Inactive (a.) Not active; inert; esp., not exhibiting any action or activity on polarized light; optically neutral; -- said of isomeric forms of certain substances, in distinction from other forms which are optically active; as, racemic acid is an inactive tartaric acid..

Scoptical :: Scoptical (a.) Jesting; jeering; scoffing.

Asterism :: Asterism (n.) An optical property of some crystals which exhibit a star-shaped by reflected light, as star sapphire, or by transmitted light, as some mica..

Ocular :: Ocular (n.) The eyepiece of an optical instrument, as of a telescope or microscope..

Autoptically :: Autoptically (adv.) By means of ocular view, or one's own observation..

Power :: Power (n.) The degree to which a lens, mirror, or any optical instrument, magnifies; in the telescope, and usually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface..

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