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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..

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..

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

Claude Lorraine Glass :: Claude Lorraine glass () A slightly convex mirror, commonly of black glass, used as a toy for viewing the reflected landscape..

Dipleidoscope :: Dipleidoscope (n.) An instrument for determining the time of apparent noon. It consists of two mirrors and a plane glass disposed in the form of a prism, so that, by the reflections of the sun's rays from their surfaces, two images are presented to the eye, moving in opposite directions, and coinciding at the instant the sun's center is on the meridian..

Image :: Image (v. t.) To represent or form an image of; as, the still lake imaged the shore; the mirror imaged her figure..

Polemoscope :: Polemoscope (n.) An opera glass or field glass with an oblique mirror arranged for seeing objects do not lie directly before the eye; -- called also diagonal, / side, opera glass..

Image :: Image (n.) The figure or picture of any object formed at the focus of a lens or mirror, by rays of light from the several points of the object symmetrically refracted or reflected to corresponding points in such focus; this may be received on a screen, a photographic plate, or the retina of the eye, and viewed directly by the eye, or with an eyeglass, as in the telescope and microscope; the likeness of an object formed by reflection; as, to see one's image in a mirror..

Tain :: Tain (n.) Thin tin plate; also, tin foil for mirrors..

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..

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

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

Speculum :: Speculum (n.) A mirror, or looking-glass; especially, a metal mirror, as in Greek and Roman archaeology..

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..

Mirror :: Mirror (n.) A looking-glass or a speculum; any glass or polished substance that forms images by the reflection of rays of light.

Infilm :: Infilm (v. t.) To cover with a film; to coat thinly; as, to infilm one metal with another in the process of gilding; to infilm the glass of a mirror..

Heliotrope :: Heliotrope (n.) An instrument for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror..

Mirroring :: Mirroring (p. pr. & vb. n.) of Mirro.

Cosmorama :: Cosmorama (n.) An exhibition in which a series of views in various parts of the world is seen reflected by mirrors through a series of lenses, with such illumination, etc., as will make the views most closely represent reality..

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..

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