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Mirror

Mirror

Background

From the earliest recorded history, humans have been fascinated by reflections. Narcissus was supposedly bewitched by his own reflection in a pool of water, and magic powers are ascribed to mirrors in fairy tales. Mirrors have advanced from reflective pools and polished metal surfaces to clear glass handheld and bathroom mirrors. They have been used in interior decoration since the 17th century, and reflective surfaces on cars and in hotel lobbies are still popular in modern design. Mirrors are used for practical purposes as well: examining our appearance, examining what is behind us on the road, building skyscrapers, and making scientific research instruments, such as microscopes and lasers.

The nature of modernn mirrors is not fundamentally different from a pool of water. When light strikes any surface, some of it will be reflected. Mirrors are simply smooth surfaces with shiny, dark backgrounds that reflect very well. Water reflects well, glass reflects poorly, and polished metal reflects extremely well. The degree of reflectivityhow much light bounces off of a surfaceand the diffusivity of a surfacewhat direction light bounces off of a surfacemay be altered. These alterations are merely refinements, however. In general, all reflective surfaces, and hence, all mirrors, are really the same in character.

Man-made mirrors have been in existence since ancient times. The first mirrors were often sheets of polished metal and were used almost exclusively by the ruling classes. Appearance often reflected, and in some cases determined, position and power in society, so the demand for looking glasses was high, as was the demand for the improvement of mirror-making techniques. Silveringthe process of coating the back of a glass sheet with melted silverbecame the most popular method for making mirrors in the 1600s. The glass used in these early mirrors was often warped, creating a ripple in the image. In some severe cases, the images these mirrors reflected were similar to those we'd see in a fun-house mirror today. Modern glassmaking and metallurgical techniques make it easy to produce sheets of glass that are very flat and uniformly coated on the back, improving image clarity tremendously. Still, the quality of a mirror depends on the time and materials expended to make it. A handheld purse mirror may reflect a distorted image, while a good bathroom mirror will probably have no noticeable distortions. Scientific mirrors are designed with virtually no imperfections or distorting qualities whatsoever.

Materials technology drastically affects the quality of a mirror. Light reflects best from surfaces that are non-diffusive, that is, smooth and opaque, rather than transparent. Any flaw in this arrangement will detract from the effectiveness of the mirror. Innovations in mirror making have been directed towards flattening the glass used and applying metal coatings of uniform thickness, because light traveling through different thicknesses of glass over different parts of a mirror results in a distorted image. It is due to these irregularities that some mirrors make you look thinner and some fatter than normal. If the metal backing on a mirror is scratched or thin in spots, the brightness of the reflection will also be uneven. If the coating is very thin, it may be possible to see through the mirror. This is how one-way mirrors are made. Non-opaque coating is layered over the thin, metal backing and only one side of the mirror (the reflecting side) is lit. This allows a viewer on the other side, in a darkened room, to see through.

Raw Materials

Glass, the main component of mirrors, is a poor reflector. It reflects only about 4 percent of the light which strikes it. It does, however, possess the property of uniformity, particularly when polished. This means that the glass contains very few pits after polishing and will form an effective base for a reflective layer of metal. When the metal layer is deposited, the surface is very even, with no bumps or wells. Glass is also considered a good material for mirrors because it can be molded into various shapes for specialty mirrors. Glass sheets are made from silica, which can be mined or refined from sand. Glass made from natural crystals of silica is known as fused quartz. There are also synthetic glasses, which are referred to as synthetic fused silica. The silica, or quartz, is melted to high temperatures, and poured or rolled out into sheets.

A few other types of glass are used for high-quality scientific grade mirrors. These usually contain some other chemical component to strengthen the glass or make it resistant to certain environmental extremes. Pyrex, for example, is a borosilicate glassa glass composed of silica and boronthat is used when mirrors must withstand high temperatures.

In some cases, a plastic substrate will do as well as a glass one. In particular, mirrors on children's toys are often made this way, so they don't break as easily. Plastic polymers are manufactured from petroleum and other organic chemicals. They can be injection molded into any desired shape, including flat sheets and circles, and can be opaque or transparent as the design requires.

These base materials must be coated to make a mirror. Metallic coatings are the most common. A variety of metals, such as silver, gold, and chrome, are appropriate for this application. Silver was the most popular mirror backing one hundred years ago, leading to the coinage of the term "silvering." Old silver-backed mirrors often have dark lines behind the glass, however, because the material was coated very thinly and unevenly, causing it to flake off, scratch or tarnish. More recently, before 1940, mirror manufacturers used mercury because it spread evenly over the surface of the glass and did not tarnish. This practice was also eventually abandoned, for it posed the problem of sealing in the toxic liquid. Today, aluminum is the most commonly used metallic coating for mirrors.

Scientific grade mirrors are sometimes coated with other materials, like silicon oxides and silicon nitrides, in up to hundreds of layers of, each a 10,000th of an inch thick. These types of coatings, referred to as dielectric coatings, are used both by themselves as reflectors, and as protective finishes on metallic coatings. They are more scratch resistant than metal. Scientific mirrors also use silver coatings, and sometimes gold coatings as well, to reflect light of a particular color of light more or less well.

Design

Surface regularity is probably the most important design characteristic of mirrors. Mirrors for household use must meet roughly the same specifications as window panes and picture frame glass. The glass sheets used must be reasonably flat and durable. The designer need only specify the thickness required; for example, thicker mirrors are more durable, but they are also heavier. Scientific mirrors usually have specially designed surfaces. These surfaces must be uniformly smooth within several lOOOths of an inch, and can be designed with a specific curvature, just like eyeglass lenses. The design principle for these mirrors is the same as that of eyewear: a mirror may be intended to focus light as well as reflect it.

The mirror design will also specify the type of coating to be used. Coating material is chosen based on required durability and reflectivity and, depending on the intended purpose of the mirror, it may be applied on the front or back surface of the mirror. Any subsequent layers of protective coatings must also be specified at this stage. For most common mirrors, the reflective coating will be applied on the back surface of the glass because it is less likely to be harmed there. The back side is then frequently mounted in a plastic or metal frame so as to entirely seal the coating from the air and sharp objects.

For scientific use, the color, or wavelength of light, which the mirror will reflect must be considered. For standard visible light or ultraviolet light mirrors, aluminum coatings are common. If the mirror is to be used with infrared light, a silver or gold coating is best. Dielectric coatings are also good in the infrared range. Ultimately, however, the choice of coating will depend on durability as well as wavelength range, and some reflectivity may be sacrificed for resilience. A dielectric coating, for example, is much more scratch resistant than a metallic coating and, despite the additional cost, these coatings are often added on top of metal to protect it. Coatings on scientific grade mirrors are usually applied on the front surface of the glass, because light which travels through glass will always distort to a small degree. This is undesirable in most scientific applications.

The Manufacturing
Process

Cutting and shaping the glass

  • 1 The first step in manufacturing any mirror is cutting the outline of the glass "blank" to suit the application. If the mirror is for an automobile, for example, the glass will be cut out to fit in the mirror mount on the car. Although some mirror manufacturers cut their own glass, others receive glass that has already been cut into blanks. Regardless of who cuts the glass, very hard, finely pointed blades are used to do the cutting. Diamond scribes or sawssharp metal points or saws with diamond dust embedded in themare often used because the diamond will wear down the glass before the glass wears down the diamond. The cutting method used depends entirely on the final shape the mirror will take. In one method, the blades or scribes may be used to cut partway through the glass; pressure can then be used to break the glass along the score line. In another method, a machine uses a diamond saw to cut all the way through the glass by drawing the blade back and forth or up and down multiple times, like an automated bandsaw. Cutting is usually done before the metal coating is applied, because the coating may flake off the glass as a result of the cut. An alternative to cutting the glass to form blanks is to mold the glass in its molten state.
  • 2 Blanks are then placed in optical grinding machines. These machines consist of large base plates full of depressions that hold the blanks. The blank-filled base is placed against another metal plate with the desired surface shape: flat, convex, or concave. A grinding compounda gritty liquidis spread over the glass blanks as they are rubbed or rolled against the curved surface. The action is similar to grinding spices with a mortar and pestle. The grit in the compound gradually wears away the glass surface until it assumes the same shape as the grinding plate. Finer and finer grits are used until the surface is very smooth and even.

    Hand grinding techniques exist as well, but they are extremely time-consuming and difficult to control. They are only used in cases where mechanical grinding would be impossible, as is the case with very large or unusually shaped surfaces. A commercial optical grinder can accommodate 50 to 200 blanks, which are all polished simultaneously. This is much more efficient than hand grinding. Even specialty optics can be made mechanically in adjustable equipment.

Applying the reflective material

  • 3 When the glass surfaces are shaped appropriately and polished to a smooth finish, they are coated with whatever reflective material the designer has chosen. Regardless of the coating material, it is applied in an apparatus called an evaporator. The evaporator is a large vacuum chamber with an upper plate for supporting the blank mirrors, and a lower crucible for melting the coating metal. It is so called because metal is heated in the crucible to the point that it evaporates into the vacuum, depositing a coating on the surface of the glass much like hot breath will steam a cold window. Blanks are centered over holes in the upper plate that allow the metal vapor to reach the surface of the glass. Metals can be heated to several hundreds or thousands of degrees (depending on the boiling point of the metal), before they vaporize. The temperature and timing for this procedure are controlled very precisely to achieve exactly the right thickness of metal. This method of coating creates very uniform and highly reflective surfaces.
  • 4 The shape of the holes in the upper plate will be transferred to the glass in metal, like paint through a stencil. This effect is often used to intentionally pattern the mirror. Metal stencils, or masks, can be applied to the surface of the glass to create one or more patterns.
  • 5 Dielectric coatingseither as reflective layers or as protective layers over metal onesare applied in much the same way, except that gases are used instead of metal chunks. Silicon oxides and silicon nitrides are typically used as dielectric coatings. When these gases combine in extreme heat, they react to form a solid substance. This reaction product forms a coating just like metal does.
  • 6 Several evaporation steps may be combined to make a multiple-layer coating. Clear dielectric materials may be evaporated on top of metal or other dielectrics to change the reflective or mechanical properties of a surface. Mirrors with silvering on the back of the glass, for instance, often have an opaque dielectric layer applied to improve the reflectivity and keep the metal from scratching. One-way mirrors are the exception to this procedure, in which case great care must be taken not to damage the thin metal coating.
  • 7 Finally, when the proper coatings have been applied, the finished mirror is mounted in a base or packed carefully in a shock resistant package for shipping.

Quality Control

How good does a mirror have to be? Is it sufficient to have 80 percent of the light bounce off? Does all 80 percent have to bounce in exactly the same direction? The answer is dependent on the application. A purse mirror might only be 80 or 90 percent reflective, and might have some slight irregularity in the thickness of the glass (like ripples on the surface of a pond). The image would be slightly distorted in this case, but the distortion would be barely visible to the naked eye. If, however, a mirror is to be used for a scientific application, for example in a telescope, the shape of the surface and the reflectivity of the coating must be known to a very specific degree, to insure the reflected light goes exactly where the telescope designer wants it, and at the right intensity. The tolerances on the mirror will affect the cost and ease with which it can be manufactured.

Batch mirror uniformity is the first and fore-most job of quality assurance. Mirrors on the edge of a grinding plate or evaporator chamber may not have the same surface or coating as those in the center of the apparatus. If there is a wide range of metal thicknesses or surface flatnesses in a single batch of mirrors, the process must be adjusted to improve uniformity.

Several methods are employed to test the integrity of a mirror. The surface quality is examined first visually for scratches, unevenness, pits, or ripples. This can be done with the unaided eye, with a microscope, or with an infrared photographic process designed to show differences in metal thicknesses.

For more stringent surface control, a profile of the mirror can be measured by running a stylus along the surface. The position of the stylus is recorded as it is dragged across the mirror. This is similar to the way a record player works. Like the record player, the drawback to a mechanical stylus is that it can damage the surface it is detecting. Mirror manufacturers have come to the same solution as the recording industry: use a laser. The laser can be used for non-destructive testing in the same way a compact disc player reads the music from a disc without altering its surface.

In addition to these mechanical tests, mirrors may be exposed to a variety of environmental conditions. Car mirrors, for example, are taken through extremes of cold and heat to insure that they will withstand weather conditions, while bathroom mirrors are tested for water resistance.

The Future

As glassmaking techniques improve, mirrors find a more elaborate place in art and architecture. Stronger, lighter glasses are more attractive to designers. Some one-way mirror manufacturing techniques allow windows to be manufactured that are mirrored on the outside. This creates a distinctive appearance on a building and also makes the building's air conditioning system more efficient by deflecting heat during the summer. This type of mirror is now commonly seen on office buildings.

Mirrors will also continue to be used in sophisticated optical applications, from microscopes and telescopes to laser-based reading systems such as compact disc players and bar code scanners.

Where To Learn More

Books

Hecht, Eugene. Optics. Addison-Wesley Publishing Co., 1974.

Korsch, Dietrich. Reflective Optics. Academic Press, 1991.

Londono, ed. Recent Trends in Optical Systems Design: Computer Lens Design. SPIE-International Society for Optical Engineering, 1987.

Periodicals

Derra, Skip. "Spin Casting Method Makes the Grade for Telescopic Mirrors." Research & Development. August, 1989, p. 24.

Folger, Tim and Roger Ressmeyer. "The Big Eye." Discover. November, 1991, p. 40.

Hogan, Brian J. "Astronomy Gets a Sharper Vision." Design News. August 26, 1991, p. 110.

"Custom Optics." Laser Focus World. December, 1992.

Nash, J. Madeline. "Shoot for the Stars." Time. April 27, 1992, p. 56.

Walker, Jearl. "Wonders with the Retroreflector, a Mirror That Removes Distortion from a Light Beam." Scientific American. April, 1986, p. 118.

Leslie G. Melcer

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mirror

mirror, in optics, a reflecting surface that forms an image of an object when light rays coming from that object fall upon it (see reflection). Usually mirrors are made of plate glass, one side of which is coated with metal or some special preparation to serve as a reflecting surface. The junction of this reflecting surface and the plate glass is called the mirror line. Highly polished metal and other materials serve also as mirrors; fused quartz is used for applications that require high precision because of its very low thermal expansion. Three common types of mirror are the plane mirror, which has a flat, or plane, surface; the convex mirror; and the concave mirror.

The Plane Mirror

In a plane mirror the rays of light falling on it are reflected with little change in their original character and their relationship to one another in space. The apparent position of the image is the same distance behind the mirror as the actual object is in front of the mirror; the image is the same size as the object and is called a virtual image (i.e., the rays of light from the object do not actually go to the image, but extensions of the reflected light rays appear to intersect behind the mirror).

Convex and Concave Mirrors

Convex and concave mirrors are known collectively as spherical mirrors, since their curved reflecting surfaces are usually part of the surface of a sphere. The concave type is one in which the midpoint or vertex of the reflecting surface is farther away from the object than are the edges. The center of the imaginary sphere of which it is a part is called the center of curvature and each point of the mirror surface is, therefore, equidistant from this point. A line extending through the center of curvature and the vertex of the mirror is the principal axis, and rays parallel to it are all reflected in such a way that they meet at a point on it lying halfway between the center of curvature and the vertex. This point is called the principal focus.

The size, nature, and position of an image formed by a concave spherical mirror depend on the position of the object in relation to the principal focus and the center of curvature. If the object is at a point farther from the mirror than the center of curvature, the image is real (i.e., it is formed directly by the reflected rays), inverted, and smaller than the object. If the object is at the center of curvature, the image is the same size as the object and is real and inverted. If the object is between the center of curvature and the principal focus, the image is larger, real, and inverted. If the object is inside the principal focus, the image is virtual, erect (right side up), and larger than the object. The position of the object can be found from the equation relating the focal length f of the mirror (the distance from the mirror to the principal focus), the distance do of the object from the mirror, and the distance di of the image from the mirror: 1/f=1/do+1/di. In the case of the virtual image, this equation yields a negative image distance, indicating that the image is behind the mirror. In the case of both the real and the virtual image, the size of the image is to the size of the object as the distance of the image from the mirror is to the distance of the object from the mirror.

In a convex spherical mirror the vertex of the mirror is nearer to the object than the edges—the mirror bulges toward the object. The image formed by it is always smaller than the object and always erect. It is never real because the reflected rays diverge outward from the face of the mirror and are not brought to a focus, and the image, therefore, is determined by their prolongation behind the mirror as in the case of the plane mirror.

History and Development

The mirror of the ancient Greeks and Romans was a disk of metal with a highly polished face, sometimes with a design on the back, and usually with a handle. Glass mirrors date from the Middle Ages. They were made in large quantities in Venice from the 16th cent., the back being covered with a thin coating of tin mixed with mercury; after 1840 a thin coating of silver was generally substituted. The introduction of plate glass for mirrors (17th cent.) stimulated the use of large stationary mirrors as part of household furniture. Small bits of silvered glass were much used in the East to adorn articles of dress and of decoration. The metal trench hand mirror of World War I revived the manufacture of mirrors of this type. More recently, aluminum was introduced as the reflecting material because it is almost as efficient as silver but is more resistant to oxidation. Mirrors play an important part in the modern astronomical telescope.

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Mirror

444. Mirror

  1. Alasnams mirror indicates to Alasnam a girls virtue. [Arab. Lit.: Arabian Nights, Prince Zeyn Alasnam]
  2. Alices looking-glass Alice passes through this into dreamland. [Br. Lit.: Through the Looking-Glass ]
  3. Cambuscans mirror warns of impending adversity; indicates anothers love. [Br. Lit.: Canterbury Tales, The Squires Tale]
  4. Laos mirror reflects the lookers mind and thoughts. [Br. Lit.: Citizen of the World ]
  5. Merlins magic mirror allows king to see whatever concerns him. [Br. Lit.: Faerie Queene ]
  6. Mirror, mirror magically tells arrogant queen who is the most beautiful of all. [Ger. Fairy Tale: Snow White in Grimm, 184]
  7. Perseuss shield he uses it as a mirror so that he will not have to look directly at Medusa. [Gk. Myth.: Howe, 214]
  8. Prester Johns mirror allows him to see happenings throughout his dominions. [Medieval Legend: Brewer Handbook, 710]
  9. Reynards wonderful mirror imaginary mirror; reflects doings a mile away. [Medieval Lit.: Reynard the Fox ]
  10. Vulcans mirror showed past, present, and future to viewer. [Br. Lit.: Orchestra, Brewer Handbook, 710]

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mirror

mir·ror / ˈmirər/ • n. a reflective surface, now typically of glass coated with a metal amalgam, that reflects a clear image. ∎ fig. something regarded as accurately representing something else: the stage is supposed to be the mirror of life. ∎  (also mirror site) Comput. a site on a network that stores some or all of the contents from another site. • v. [tr.] (of a reflective surface) show a reflection of: the clear water mirrored the sky. ∎ fig. correspond to: gradations of educational attainment that mirror differences in social background. ∎  Comput. keep a copy of some or all of the contents of (a network site) at another site, typically in order to improve accessibility. ∎  [usu. as n.] (mirroring) Comput. store copies of data on (two or more hard disks) as a method of protecting it. DERIVATIVES: mir·rored adj.

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mirror

mirror Highly polished surface that produces an image of objects in front of it because of the laws of reflection. Most mirrors are made of glass ‘silvered’ on one side with silver, mercury, or aluminium. They can be flat (plane) or curved (spherical or parabolic). Plane mirrors produce a virtual image that is the same size but turned sideways (left to right). Spherical mirrors may be concave (caving inwards) or convex (bulging outwards). The image can be right-way-up or inverted, real or virtual, depending on the position of the object in relation to the focal point of the mirror; it may also be either magnified or reduced in size. A spherical mirror suffers spherical aberration (a blurred image), which is absent in a concave parabolic mirror, as used in reflecting telescopes. See also image

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mirror

mirror all done with mirrors an apparent achievement with an element of trickery, alluding to explanations of the art of a conjuror.
Mirror, mirror on the wall, Who is the fairest of them all? in the early 19th-century translation of the Grimm Brothers' Fairytales, the customary invocation of Snow White's wicked stepmother, which in due time received the reply that Snow White rather than herself now held the palm of beauty.

See also smoke and mirrors.

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mirror

mirror XIII. ME. mirour — OF. mirour (mod. miroir):- Rom. *mīrātōrium, f. mīrāre, mīrāt- look at, (in pre-classical L.) wonder (see MIRACLE); from XVI the sp. was modelled on words in -OR2.

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Mirror

MIRROR

SeeZERKALO

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mirror

mirrorairer, bearer, carer, Clara, darer, declarer, Demerara, Éire, habanera, Halmahera, parer, Perak, primavera, repairer, Rivera, Riviera, Sarah, scarer, sharer, snarer, sparer, squarer, starer, swearer, tearer, wearer •cause célèbre • torch-bearer •swordbearer • pallbearer • wayfarer •seafarer • capoeira • Phaedra •sacra, simulacra •Libra, vers libre •ex cathedra •chypre, Yprespalaestra (US palestra) • urethra •joie de vivre •mirror, sirrah •Coimbra • Middlesbrough • Indra •Sintra •aspidistra, sistra •algebra • orchestra • vertebra •Beira, Fujairah, Hegira, Lyra, Myra, naira, palmyra, spirogyra •Hydra • Lycra •begorra, Gomorrah, horror •double entendre • genre • amour propre • Le Nôtre • contra •Cosa Nostra, rostra

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