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 ?
Again, within the painting there is the same circular look: the woman looks into the hand mirror to see the image in the wall mirror of her head and arm.
Use a hand mirror to see yourself in the full-length mirror, or have your partner inspect you from the back.
But today we have no swiveling barber chair and only a hand mirror, so I move it wide from left to right, angling my head and cutting my eyes to see the top and sides--settling for just a bit more than 180 degrees.
This cute hand mirror opens to reveal a lipstick, powder and rouge.
He tapped on the shoulder of one student, and told the class, ''Bring a hand mirror next time.
If you want, use a hand mirror so you can see what you're doing.
On the satiny white sheets of a veiled four-poster bed, Phaedra (Chalfant) peers into a hand mirror contemplating the disturbing new crow's feet that appear on her face.
I had a little desert, I kept it in the study, it was a few inches across, like a hand mirror, it moved a few inches at a time, like an ice age, I listened to 'Cortez', the atonal opera mecanique, you could spend a siecle waiting for it to begin, cancel every date, another siecle before the fin, who isn't happy to be a killing machine?
Apply plenty of shave gel while in front of your bathroom mirror, using a hand mirror to get the best view of the back of your head.
Remove potentially damaging vegetation from behind downpipes by cutting back or removing the plant altogether Use a hand mirror to look behind rainwater pipes as splits and cracks in old cast iron and aluminium often occur here and are not easily noticed, Have gutters refixed if they are sloping the wrong way or discharging water onto the wall If sections are beyond repair, make sure that replacements are made of the same material as the originals.
5: Use a hand mirror to look behind rainwater pipes for splits and cracks in old cast iron and aluminium.
Perform the examination under a bright light, using a full-length mirror as well as a hand mirror," advises Dr.