mirror

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mir·ror

(mir'ŏr),
A polished surface reflecting the rays of light reflected from objects in front of it.
[Fr. miroir, fr. L. miror, to wonder at]

mirror

/mir·ror/ (mir´er) a polished surface that reflects sufficient light to yield images of objects in front of it.
dental mirror  mouth m.
frontal mirror , head mirror a circular mirror strapped to the head of the examiner, used to reflect light into a cavity, especially the nose, pharynx, or larynx.
mouth mirror  a small mirror attached at an angle to a handle, for use in dentistry.
noun An archiving device written to more than one hard disk simultaneously, so that if one disk fails, the computer continues to function without loss of data
verb To maintain an exact copy of a file or database

mirror

Informatics noun An archiving device written to more than one hard disk simultaneously, so that if one disk fails, the computer continues to function without loss of data verb To maintain an exact copy of a file or database. See FTP, Web Paranormal See Mind mirror.

mir·ror

(mir'ŏr)
A polished surface reflecting the rays of light reflected from objects in front of it.

mirror

A surface capable of reflecting light rays and forming optical images. Such surfaces are smooth or polished, made of highly polished metal, or a thin film of metal (e.g. aluminium) on glass, quartz or plastic. Object distance l and image distance l′ relate to the focal distance f or the radius of curvature r of the mirror, as follows
2/r represents the refractive power of the mirror, in air. If the medium that contains the incident and reflected rays is n, the power becomes F = 2n/r and the focal length, f = r/2n (Fig. M12). See focal length; fundamental paraxial equation; catadioptric system.
back surface mirror A mirror which reflects from the back surface of a refracting layer, usually glass. See front surface mirror.
concave mirror A mirror with a spherical concave surface forming an erect, magnified, virtual image when the distance from the mirror is less than the focal distance and an inverted real image when the object distance is greater than the focal distance (Fig. M12).
convex mirror A mirror with a spherical convex surface forming a virtual, erect and diminished image (Fig. M12).
front surface mirror A mirror that reflects directly from its front surface. The advantages of this type are that, unlike back surface mirrors, there is no chromatic effect as the glass is not used optically, therefore ultraviolet rays can be used which would otherwise be absorbed in the glass and there is no ghost reflection from the front surface. However, these mirrors can be easily scratched and the coating may tarnish. Often a coating of silicon monoxide is evaporated on top of the surface, but this causes a loss of reflectivity. See ghost image; back surface mirror.
plane mirror A mirror whose surface is plane and forms a virtual image of the same size as the object. Object and image distances are equal.
semi-silvered mirror See beam splitter.
mirror writing Writing backward, Latin letters being written from right to left and the details of the letters reversed. The writing thus appears normal when viewed in a mirror. Syn. retrography.
Fig. M12 Image of an object O formed in A, a concave mirror and B, a convex mirror. Four rays are drawn in each case for completeness, but two would suffice (C, centre of curvature; F ′, focal point; f ′, focal length; l and l ′, object and image length; r , radius of curvature)enlarge picture
Fig. M12 Image of an object O formed in A, a concave mirror and B, a convex mirror. Four rays are drawn in each case for completeness, but two would suffice (C, centre of curvature; F′, focal point; f′, focal length; l and l′, object and image length; r, radius of curvature)

mir·ror

(mir'ŏr)
A polished surface reflecting the rays of light reflected from objects in front of it; particularly useful in visualizing structures in the oral cavity.
References in periodicals archive ?
see" as one thing, and the plum tree painted on the hand mirror as
And also like top hoteliers, she filled the adjoining bath with little luxuries such as French soap, shower gels, shampoos, hair dryer and a hand mirror so that guests can check out the back of a hairdo.
Women in the early 1900s were advised to carry a small hand mirror in the car's tool drawer so they could hold it aloft to see any traffic behind, and warn the driver.
A 50-year-old Kanagawa prefectural policeman was arrested Monday for allegedly peeking up a woman's skirt in Tokyo's JR Shinjuku Station by using a hand mirror, police said.
Next Laynie grew pinking shears from nail scissors, a soup ladle from a teaspoon, and a hand mirror from a piece of foil.
Three times British Army rifle champion, Milland had no problem standing off camera and shooting a hand mirror out of actress Lya de Putti's hand.
Participants, seated in a circle, would pass around a small hand mirror.
As he lovingly inspected the results in a hand mirror, he smiled and assured me, "Next to me, Errol Flynn looks like a piece of shit.
Then, looking in a hand mirror she aimed and fired.
All you need is an adequate source of light and a hand mirror.
As I stuffed my school books into my backpack, I looked into my hand mirror once more.