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Topic: Optical Phenomenon

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Optical phenomenon - Wikipedia, the free encyclopedia An optical phenomenon is any observable event which results from the interaction of light and matter. Common optical phenomena are often due to the interaction of light from the sun or moon with the atmosphere, clouds, water, or dust and other particulates. Aura, a phenomenon in which gas or dust surrounding an object luminesces or reflects light from the object. en.wikipedia.org /wiki/Optical_phenomenon   (582 words)

Glory (optical phenomenon) - Wikipedia, the free encyclopedia A glory is an optical phenomenon produced by light reflected toward its source by a cloud of uniformly-sized water droplets. Records of the phenomenon at Mount Emei date back to A.D. The colorful halo always surrounds the observer's own shadow, and thus was often taken to show the observer's personal enlightenment (associated with Buddha or something divine) until modern science explained the optics behind the phenomenon. The angular size is much smaller than a rainbow, about 5° to 20°, depending on the size of the droplets. en.wikipedia.org /wiki/Glory_(optical_phenomenon)   (336 words)

report.htm Essentially, optical activity is a phenomenon that is related to the dissymmetry of molecules. Optical activity phenomenon can be reduce to the fact that light have different response to right and left circularly polarized light. This phenomenon occurs when the planes of the electric field, oscillate in the “x” and “y” direction, have equal amplitudes but different phase. www.u.arizona.edu /~nguyen1/report.htm   (549 words)

Optical Illusions Etc: free, scary, word & picture optical illusions Square A is exactly the same shade of grey as square B. mirage is a natural illusion that is an optical phenomenon. The variation in the apparent size of the Moon (smaller when overhead, larger when near the horizon) is another natural illusion; it is not an optical phenomenon, but rather a cognitive or perceptual illusion. Optical illusions can naturally happen by specific optical tricks that show particular assumptions in the human perceptual system. illusionsetc.blogspot.com /2004/05/what-are-optical-illusions.html   (903 words)

Condon Report, Sec VI, Chapter 4: Optical Mirage An optical mirage is a phenomenon associated with the refraction of light in the gaseous (cloud-free) atmosphere. The summary presents a set of standards by which to interpret the nature of an optical observation in terms of a specific natural atmospheric phenomenon. The optical refractive index (n) is defined as the ratio of the velocity (v) at which monochromatic (single wavelength) light is propagated in a homogeneous, isotropic, non-conductive medium, to the velocity (c) of light in free space, i.e., n = c/v. www.project1947.com /shg/condon/s6chap04.html   (14997 words)

From Twinkling Stars to Theater Missile Defense Optical turbulence is caused by the presence of adjacent parcels of air, at a slightly different index of refraction moving about in a beam of light. Optical turbulence, or fluctuations of the index of refraction in both space and time, is not only apparent in twinkling stars, but is also a major source of performance degradation for high-energy laser systems. The optical turbulence associated with the desired level of performance was then expressed as a multiple of the performance computed using the CLEAR 1 model. www.afrlhorizons.com /Briefs/Mar01/VS0004.html   (1133 words)

Phenomenon - It is possible to list the phenomena which are relevant to almost any field of endeavor, for example, in the case of optics and light one can list observable phenomena under the topic optical phenomenon. Phenomenon has a specialized meaning in the philosophy of Immanuel Kant who contrasted the term Phenomenon with noumenon. A phenomenon (plural: phenomena) is an observable event, particularly something special (literally something that can be seen, derived from the Greek word phainomenon = observable). psychcentral.com /psypsych/Phenomenon   (569 words)

SPR The phenomenon of anomalous diffraction on diffraction gratings due to the excitation of surface plasma waves was first described in the beginning of the twentieth century by Wood [1]. In the late sixties, optical excitation of surface plasmons by the method of attenuated total reflection was demonstrated by Kretschmann [2] and Otto [3]. The characteristic of this phenomenon which makes SPR an analytical tool is that any change in the chemical composition of the environment within the range of the plasmon field causes a change in the wavelength of light that resonates with the plasmon. chem.ch.huji.ac.il /~eugeniik/spr.htm   (3027 words)

Optical Interference Coatings This paper explores the fundamental phenomenon of optical interference and the theory of optical interference coatings. The technology of optical interference coatings has been expanded rapidly in the past fifty years and is expected it will continue to do so in the future. The applications of optical coatings are involved in everyday lives from antireflection coatings on eyeglasses to security coatings on bank notes [7]. www.u.arizona.edu /~waisze/report.html   (939 words)

PROFESSIONAL EYECARE ASSOCIATES - Optical 2000 Another complaint with bifocals is the optical phenomenon known as "jump" that is created when you move your eyes from the distance portion of the lens, through the demarcation line and into the near portion. www.3d-eye.com /3d-eye/clients/active/optical2000/3deye.php?goto=ELOB   (289 words)

Glory image index Mountain ~ Sea ~ Woodlands ~ Glories and Brocken Spectres www.sundog.clara.co.uk /droplets/gloim1.htm   (10 words)

The Definitions of Persistence of Vision Prince (2001) defines persistence of vision as the phenomenon where “the retina of the eye retains an image for a fraction of a second after the source is gone“ (p. This phenomenon is widely known as “after-images” and has no real relation to perception of motion in film, according to both Nichols and Lederman (1978) and Anderson and Fisher (1978). He is also incorrect in stating that Roget described the phenomenon. www.pamcole.com /DOCS/POV.html   (3495 words)

optical_illusion.htm An optical phenomenon that results in a false or deceptive visual impression. Yet, despite which definition is preferred, the phenomenon of an optical illusion remains the same. Optical illusions are one of my favorite diversions-- they are not only fascinating, but are a fun way to test your vision. www.mercola.com /2005/jun/28/optical_illusion.htm   (956 words)

The Heiligenschein In German, we must distinguish between its use for the optical phenomenon under discussion, for the phenomenon called the glory in English, and for the halos that are the effect of refraction and reflection in ice crystals. A related phenomenon, the glory (q.v.) is also seen around the shadow of your head, but a shadow in a cloud or fog, where the drops are much smaller, say 20 μm in diameter, than in the dewy grass, where the drops are millimeter sized. The principal points, nodal points and optical centre of the sphere all fall on the centre of the sphere. www.du.edu /~jcalvert/astro/heilig.htm   (2120 words)

Mineral Optics Survival Kit The purpose of this table is to act as a revision aid for mineral optics, by summarising the observable optical properties according to the type of optical phenomenon that produces them. In observing minerals under the microscope, there are a number of optical properties to record, in addition to the simple microstructural observations like size, shape, cleavage, and the mutual relationships of minerals. teachserv.earth.ox.ac.uk /courses/es2-metrock/mosk.html   (149 words)

Kristan Corwin's Research Group For 2 years in Boulder, CO at NIST in the group of Sarah Gilbert, she studied the nonlinear optical phenomenon of supercontinuum generation, and explored optical frequency metrology in the near infrared wavelength regime, of interest to the telecommunications industry. Her group is currently creating ultrafast stabilized lasers for optical frequency metrology, with the goal of improving the standards of the optical telecommunications industry. In August 2003, Dr. Corwin brought the technology of optical frequency measurement and infrared pulsed lasers to Kansas State University. www.phys.ksu.edu /personal/corwin/corwin.htm   (230 words)

UFO Sighting Report January 7th 2005 : Hermosillo Coast near Puerto Libertad, Mexico The conclusion reached by astronomers and ophtalmologists is that it is an “optical illusion” caused by ambient temperature, the distance between the observer and the object, the angle of incidence of light and the intensity of the light itself. Theories-a.) An optical illusion created by the camera, although heat and humidity conditions were not the correct ones at the time; b.) A meteor crashed into the hill and shattered it. These optical illusions can be seen from diferent directions,” he stressed. www.ufoinfo.com /sightings/mexico/050107.shtml   (795 words)

RECENT PUBLICATIONS OF CHRISTOPHER C Abstract: A "superresolution" phenomenon has been recently reported in images of diffraction gratings obtained with a near-field optical microscope probe positioned at distances on the order of a micrometer from the surface. We show that the effect observed in the experiment is a very well known far-field optical phenomenon called the Talbot effect. Step-index single-mode optical fibers were tapered and then cleaved by ion beam milling to allow direct examination of the mode evolution in the taper with a microscope objective and CCD camera. www.ee.umd.edu /~davis/recentpubls99.html   (2740 words)

Harshwardhan Wanare: Experience His area of interest is coherent control of optical phenomenon in semiconductors. The phenomenon of Two-photon absorption has wide range of applications from study of microscopic samples to analysis of astrophysical phenomenon. All optical switching devices have suffered from various limitations, one main limitation being the efficiency of switching at low power levels of light. www.phy.ilstu.edu:16080 /~ilp/wanare/experience.html   (1434 words)

Glory (disambiguation) - Wikipedia, the free encyclopedia In Optics, A glory is an optical phenomenon produced by light reflected toward its source by a cloud of uniformly-sized water droplets. In cinema, Glory is a 1989 film which depicts the Unionists' attack on Fort Wagner during the American Civil War. In Buffy the Vampire Slayer, Glory is a goddess from a hell dimension. en.wikipedia.org /wiki/Glory_(disambiguation)   (215 words)

Optical Magic Metropolis Magazine For him the optical phenomenon (the result of a refraction taking place in the eye of the spectator, not in the room itself) served as a demonstration that what we see is a visual construction. The disconcerting cavelike setup was as much a part of the experiment as the optical devices and prismatic projections exhibited in it. One of his early installations for a 1993 group show at the GLOBE Kuratorengruppe, in Copenhagen, consisted of a lamp illuminating a fine spray of atomized water, creating the fugacious apparition of a rainbow in the mist (Beauty). www.metropolismag.com /cda/story.php?artid=1913   (1423 words)

R.Babbitt Spatial-spectral holographic (SSH) phenomenon encompasses optical coherent transients, photon echoes, and time-domain spectral hologram analogous to the manner in which angled beams are recorded in spatial holograms. An appropriately programmed material processes incoming broadband optical beams by multiplying their Fourier decompostion be the material’s programmed frequency response, resulting in a processed output temporal waveform. SSH materials thus offer an unmatched ability to store, process, and route complex broadband optical signals with precise phase and delay control. www.spectrum.montana.edu /babbitt.html   (136 words)

Minimal Paths theory This phenomenon occurs when the variations in temperature are important enough to deviate the light path, resulting in ``visions'' of an oasis in the desert, for example. Hamilton defined optical path functions, which best known was defined by Burns as the applied to the development of a mathematical theory of optical systems. Right image is a diagram which illustrates the mirage phenomenon on the basis of the propagation of the light in heterogeneous media, as shown in middle image. math.lbl.gov /~deschamp/phdthesis/node10.html   (833 words)

Title page for ETD Since the refractive index differentials responsible for the guiding phenomenon at optical frequencies are directly dependent on concentration of dopants like fluorine and germania, radial diffusion of such dopants causes the fiber cores that are heated in a platinum wire furnace to come closer together. Such proximity leads to the phenomenon of evanescent field interaction or coupling of optical power from one arm of the coupler to the other. The theoretical basis for the same phenomenon in a single mode coupler is developed, on the basis of the theory of diffusion and the Gaussian approximation for circular fibers. scholar.lib.vt.edu /theses/public/etd-51697-144745/etd-title.html   (401 words)

Measurement of the 'optical' Kerr effect induced by nanosecond laser pulses The phenomenon is thus an optically induced optical effect (an optico-optical phenomenon). In the optical Kerr effect (OKE) the high-frequency electric field of a laser beam is the inducing mechanism. It has potential as a means of measuring the optical polarizability of molecules which itself is useful for determining molecular bonding structures. stacks.iop.org /0022-3727/24/645   (313 words)

Natural fiber optic - ulexite It seems unusual that this optical phenomenon of fibrous mineral aggregates had not been noted and described previously, but such seems to be the case. Since we could find no reference in the mineralogical literature to this phenomenon, although known for synthetic fibers, it was thought desirable to report on this optical property. Microscopic studies of the images made it evident that the optical effect was due to the reflections along the twinned fiber interfaces. www.minsocam.org /msa/collectors_corner/arc/ulexitefiberoptic.htm   (826 words)

Aubert's phenomenon (www.whonamedit.com) Phenomenon of optical delusion for the factual position of the subjective vertical line. The phenomenon is most clearly seen in the dark. In an upright position of the body the subjective vertical line appears to be moving in the opposite direction when the head is turned. www.whonamedit.com /synd.cfm/282.html   (114 words)

Towering Shafts Of Light The night illuminations are a rare natural phenomenon in which lights on the ground are reflected in the hexagonal crystals that form in the cirrostratus. According to experts, the phenomenon can only be observed in ideal weather conditions when the height of the cloud matches the distance from the source of the light to the observer." Ice crystals in the atmosphere can dazzle us with bright haloes, sundogs, and similar optical phenomena -- as long as the sun or moon are shining. www.science-frontiers.com /sf126/sf126p07.htm   (378 words)

'Optical Activity in Abiotic Fluids'           With no recourse to any such artifices, the phenomenon of optical activity in fluids is here shown to be an inevitable consequence of the dictates of thermodynamic stability theory manifested by systems which contain quite ordinary, covalent-bonded molecules, in certain conditions of density. Equation (12) expresses succinctly and rigorously the essential determining factors for the spontaneous, abiotic, evolution of optical activity in fluids:  the competition between the entropy of mixing, given by the first logarithmic term, and the oppositely-directed effects of the inevitable packing inefficiency of mixed enantiomers, given by the thermodynamic chirality function, Q The genesis of optical activity in abiotic fluids. www.gasresources.net /OpticalAcitivity.htm   (2378 words)

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