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Aberration :: Aberration (n.) The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same point, or the deviation of such rays from a single focus; called spherical aberration, when due to the spherical form of the lens or mirror, such form giving different foci for central and marginal rays; and chromatic aberration, when due to different refrangibilities of the colored rays of the spectrum, those of each color having a distinct focus..

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..

Opeidoscope :: Opeidoscope (n.) An instrument, consisting of a tube having one end open and the other end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singing into it..

Mirror :: Mirror (n.) That which gives a true representation, or in which a true image may be seen; hence, a pattern; an exemplar..

Concave :: Concave (a.) Hollow and curved or rounded; vaulted; -- said of the interior of a curved surface or line, as of the curve of the of the inner surface of an eggshell, in opposition to convex; as, a concave mirror; the concave arch of the sky..

Focus :: Focus (n.) A point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror..

Homelyn :: Homelyn (n.) The European sand ray (Raia maculata); -- called also home, mirror ray, and rough ray..

Larungoscope :: Larungoscope (n.) An instrument, consisting of an arrangement of two mirrors, for reflecting light upon the larynx, and for examining its image..

Helioscope :: Helioscope (n.) A telescope or instrument for viewing the sun without injury to the eyes, as through colored glasses, or with mirrors which reflect but a small portion of light..

Glass-faced :: Glass-faced (a.) Mirror-faced; reflecting the sentiments of another.

Scioptics :: Scioptics (n.) The art or process of exhibiting luminous images, especially those of external objects, in a darkened room, by arrangements of lenses or mirrors..

Mirror :: Mirror (v. t.) To reflect, as in a mirror..

Reflective :: Reflective (a.) Throwing back images; as, a reflective mirror..

Catoptron :: Catoptron (n.) A reflecting optical glass or instrument; a mirror.

Tracheoscopy :: Tracheoscopy (n.) Examination of the interior of the trachea by means of a mirror.

Camera Obscura :: Camera obscura () An apparatus in which the images of external objects, formed by a convex lens or a concave mirror, are thrown on a paper or other white surface placed in the focus of the lens or mirror within a darkened chamber, or box, so that the outlines may be traced..

Glass :: Glass (v. t.) A looking-glass; a mirror.

Tin :: Tin (n.) An elementary substance found as an oxide in the mineral cassiterite, and reduced as a soft white crystalline metal, malleable at ordinary temperatures, but brittle when heated. It is not easily oxidized in the air, and is used chiefly to coat iron to protect it from rusting, in the form of tin foil with mercury to form the reflective surface of mirrors, and in solder, bronze, speculum metal, and other alloys. Its compounds are designated as stannous, or stannic. Symbol Sn (Stannum). At

Rhinoscope :: Rhinoscope (n.) A small mirror for use in rhinoscopy.

Condenser :: Condenser (n.) A lens or mirror, usually of short focal distance, used to concentrate light upon an object..

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