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Mirror - Image in a mirror |  | Mirror - Image in a mirror: Encyclopedia II - Mirror - Image in a mirror |  | For an object with approximate reflection symmetry, a reflection in some mirror plane corresponds to a combination of:
a translation if the mirror is parallel to the symmetry plane of the object, and otherwise a rotation about the line of intersection of the two planes by an angle which is twice the angle between the two planes
a reflection in the approximate symmetry plane of the object (due to t ...
See also:Mirror, Mirror - Effect, Mirror - Image in a mirror, Mirror - Composition, Mirror - Applications, Mirror - Viewing one's own body, Mirror - Instruments, Mirror - Safety and easier viewing, Mirror - One-way mirror, Mirror - Decoration, Mirror - Signaling, Mirror - Entertainment, Mirror - Mirrors in literature |  | | Mirror, Mirror - Applications, Mirror - Composition, Mirror - Decoration, Mirror - Effect, Mirror - Entertainment, Mirror - Image in a mirror, Mirror - Instruments, Mirror - Mirrors in literature, Mirror - One-way mirror, Mirror - Safety and easier viewing, Mirror - Signaling, Mirror - Viewing one's own body, Aranmula kannadi, Digital Micromirror Device, Periscope, Cold Mirror and Hot Mirror, Mirror Master, Venus effect, Anamorphosis and Anamorphism, Kazuhide Uekusa - A Japanese economist who used a hand mirror to peep under a schoolgirl's skirt |  | |
|  |  | Mirror: Encyclopedia II - Mirror - Image in a mirror
Mirror - Image in a mirror
For an object with approximate reflection symmetry, a reflection in some mirror plane corresponds to a combination of:
- a translation if the mirror is parallel to the symmetry plane of the object, and otherwise a rotation about the line of intersection of the two planes by an angle which is twice the angle between the two planes
- a reflection in the approximate symmetry plane of the object (due to the assumption this is a minor change)
We can apply this to the image in a mirror of, say, a standing person, because people have approximate bilateral symmetry. The image is the most realistic if it is still vertical, i.e., if the rotation is about a vertical axis. This is the case iff the mirror is vertical. In this case the image of the person is in normal standing orientation and vertically in a normal position, at a horizontally different position and with an orientation rotated about a vertical axis, the latter except if the mirror is parallel to the approximate symmetry plane of the person.
In particular, if one looks at one's image in a vertical mirror in left-right orientation, the image corresponds to a rotation by 180° about the vertical axis in the mirror, combined with a reflection in one's approximate symmetry plane.
When the rotation is so obvious that it is not worth mentioning, the second component in this decomposition of the effect of the mirror is sometimes emphasized, by saying that a mirror "reverses left and right".
Other related archivesAnamorphism, Anamorphosis, Aranmula kannadi, Argentine, Christmas tree, Cold Mirror, Digital Micromirror Device, Hot Mirror, Hotel California, Japanese, Jorge Luis Borges, Kazuhide Uekusa, Mirror Master, Native American, Palace of Versailles, Periscope, Rear-view mirror, Telescopes, The Eagles, Tlön, Uqbar, Orbis Tertius, Venus effect, aberration in optical systems, adaptive optics, aluminium, amusement parks, angle, back silvered, beam splitter, bilateral symmetry, clothing, cocaine, cold mirrors, concave, convergent, convex, copper, copulation, dielectric, dielectric mirrors, economist, ego, focus, glass, hair, hall of mirrors, heresiarch, hot mirrors, iff, illusion, impersonation, infinity, infrared, interferometry, interior decoration, kilometres, labyrinths, lasers, left and right, light, make-up, metal, militaries, mirror image, motorcycle helmets, optical, optical coating, optical instrument, parabolic, parallel, parking lots, peep, physical appearance, plane, reflection symmetry, reflectometer, road junctions, silver, specular reflection, sphere, spherical aberration in lens (optics), sun, sunglasses, transparent, upskirt, vehicles, video camera, voyeurism, wavelength, wavelengths
 Adapted from the Wikipedia article "Image in a mirror", under the G.N U Free Docmentation License. Please also see http://en.wikipedia.org/wiki |
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