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Eyepiece :: Eyepiece (n.) The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed..

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..

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..

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

Backboard :: Backboard (n.) A thin stuff used for the backs of framed pictures, mirrors, etc..

Creep :: Creep (v. t.) To slip, or to become slightly displaced; as, the collodion on a negative, or a coat of varnish, may creep in drying; the quicksilver on a mirror may creep..

Reflect :: Reflect (v.) To bend back; to give a backwa/d turn to; to throw back; especially, to cause to return after striking upon any surface; as, a mirror reflects rays of light; polished metals reflect heat..

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

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..

Anamorphosis :: Anamorphosis (n.) A distorted or monstrous projection or representation of an image on a plane or curved surface, which, when viewed from a certain point, or as reflected from a curved mirror or through a polyhedron, appears regular and in proportion; a deformation of an image..

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

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

Optigraph :: Optigraph (a.) A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper..

Catoptrics :: Catoptrics (n.) That part of optics which explains the properties and phenomena of reflected light, and particularly that which is reflected from mirrors or polished bodies; -- formerly called anacamptics..

Siderostat :: Siderostat (n.) An apparatus consisting essentially of a mirror moved by clockwork so as to throw the rays of the sun or a star in a fixed direction; -- a more general term for heliostat.

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

Looking-glass :: Looking-glass (n.) A mirror made of glass on which has been placed a backing of some reflecting substance, as quicksilver..

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..

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..

Glass :: Glass (v. t.) To reflect, as in a mirror; to mirror; -- used reflexively..

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