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Topics related to "Refractive index"

index number
index number in econometrics, a figure reflecting a change in value or quantity as compared with a standard or base. The base usually equals 100 and the index number is usually expressed as a percentage. For example, if a commodity cost twice as much in 1970 as it did in 1960, its index number woul... Read more
beryl
beryl , mineral, a silicate of beryllium and aluminum, Be 3 Al 2 Si 6 O 18 , extremely hard, occurring in hexagonal crystals that may be of enormous size and are usually white, yellow, green, blue, or colorless. Beryl is commonly used as a gemstone. The refractive index is low, and the stones have l... Read more
cephalic index
cephalic index [Gr. kephale =head], ratio of the breadth of the head to its length. Expressed as a percental number, it provides the simplest description of the geometric relation of two dimensions. The index is obtained by dividing the maximum width of the cranium by its maximum length and multip... Read more
Index
Index in the Roman Catholic Church, list of publications forbidden to be read, called Index librorum prohibitorum [list of forbidden books]. This censorship was exercised by the Holy See. Catholics are forbidden, as a natural part of ethics, to read anything they know may endanger their faith or ... Read more
Consumer Price Index
Consumer Price Index (CPI) 1. In the UK, the usual name for the Harmonized Index of Consumer Prices (HICP), a measure of price level introduced in 1997 to enable comparisons within the EU. In 2003 the Chancellor of the Exchequer announced that government inflation targets would subsequently be base... Read more
Canada balsam
Canada balsam yellow, oily, resinous exudation obtained from the balsam fir . It is an oleoresin (see resin ) with a pleasant odor but a biting taste. It is a turpentine rather than a true balsam. On standing, the essential oil in Canada balsam evaporates, leaving behind the resin as a hard, tr... Read more
refraction
refraction in physics, deflection of a wave on passing obliquely from one transparent medium into a second medium in which its speed is different, as the passage of a light ray from air into glass. Other forms of electromagnetic radiation , in addition to light waves, can be refracted, as can soun... Read more
Jean Bernard Léon Foucault
Jean Bernard Léon Foucault , 1819-68, French physicist. Known especially for his research on the speed of light, he determined its velocity in air and found that its speed in water and other media diminished in proportion to the index of refraction. He originated the Foucault pendulum , with... Read more
fiber optics
fiber optics transmission of digitized messages or information by light pulses along hair-thin glass fibers. Each fiber is surrounded by a cladding having a high index of refractance so that the light is internally reflected and travels the length of the fiber without escaping. Cables of optical fi... Read more
opal
opal , a mineral consisting of poorly crystalline to amorphous silica, SiO 2 · n H 2 O; the water content is quite variable but usually ranges from 3% to 10%. Common opal is usually colorless or white, but it may be gray, brown, yellow, or red; the color is due to fine-grained impurities. Opa... Read more

Encyclopedia entries related to "Refractive index"

optical mineralogy
Book article from: The Oxford Companion to the Earth ...embedded in a mount with a refractive index of 1.54. The optical properties...velocities and hence have different refractive indices. The difference between the...distinctive property is the refractive index (R. I.), which can...
Eye Glasses and Contact Lenses
Encyclopedia entry from: Gale Encyclopedia of Medicine, 3rd ed. ...lenses are devices that correct refractive errors in vision. Eyeglass...eyeglasses. People whose eyes have refractive errors do not see clearly...the retina. The greater the index of refraction of the lens...suitable for people with large refractive errors. A plastic called...
petrology, petrography, petrogenesis
Book article from: The Oxford Companion to the Earth ...stage so that the various colours and refractive indices become apparent as the stage is rotated...balsam upon which the rock is mounted has a refractive index of 1.538. Minerals whose refractive index is higher than this appear to stand...
Eyeglasses and Contact Lenses
Encyclopedia entry from: Gale Encyclopedia of Children's Health: Infancy through Adolescence ...lenses are devices that correct refractive errors in vision. Eyeglass...eyeglasses. People whose eyes have refractive errors do not see clearly without...the retina. The greater the index of refraction of the lens material...without bubbles, and have a high index of refraction. The greater...
Lens
Encyclopedia entry from: The Gale Encyclopedia of Science ...is done using the simple formula where n is the refractive index of the glass, and r1 and r2 are the radii of curvature...instance, chromatic aberration occurs because the refractive index depends on the wavelength, and so the lens has a...
Fiber Optics
Encyclopedia entry from: The Gale Encyclopedia of Science ...physical quantity known as index of bottom material. According...sandwiched between two lower index layers (Figure 3). Light enters the higher index material, hits the upper...central core and cladding refractive indices equal to those of desired...
glass
Book article from: The Columbia Encyclopedia, Sixth Edition ...and electrical resistance; barium, to increase the refractive index, as in optical glass; cerium, to absorb infrared...rock crystal, was at first applied to clear, highly refractive glass; it has come to denote in the trade a high...
quantitative analysis
Book article from: World Encyclopedia ...volumetric analysis) or weight ( gravimetric analysis). Physical methods measure qualities such as density and refractive index (how much light is refracted by a medium). A qualitative analysis identifies the chemical elements or ions.
zircon
Book article from: World Encyclopedia ...gravel. It displays prismatic crystals. It is usually light or reddish brown, but can be colourless, grey, yellow or green. It is used widely as a gemstone because of its hardness and high refractive index. Hardness 7.5; r.d. 4.6.
Diamond
Encyclopedia entry from: The Gale Encyclopedia of Science ...developed smooth faces. Diamonds are the hardest mineral (10 on the Mohs’ scale), with the highest refractive index of 2.417 among all transparent minerals, and has a high dispersion of 0.044. Diamonds are brittle. Under UV...

Dictionary entries related to "Refractive index"

refractive index
Book article from: A Dictionary of Astronomy refractive index (symbol n ) A measure of the refractive power of a transparent medium such as glass. Mathematically, the refractive index is the ratio of the sines of the angles of incidence...
refractometer
Book article from: A Dictionary of Earth Sciences ...instrument used to determine refractive index . Several types are available...measures the critical angle. The refractive index is then calculated by Snell...primarily for determining the refractive index of liquids. It consists...
half-shadow test
Book article from: A Dictionary of Earth Sciences ...test used to determine the approximate refractive index of a mineral by immersion in a liquid of known refractive index. A card is inserted below the...the card. If the mineral differs in refractive index from the liquid, one side of...
Becke line test
Book article from: A Dictionary of Earth Sciences ...to determine the approximate refractive index of a mineral . In plane-polarized...into the medium with the higher refractive index. The medium could be either an adjacent mineral of known refractive index or, more commonly, the...
Gladstone, John Hall
Dictionary entry from: Complete Dictionary of Scientific Biography ...the measurement of the decrease in the refractive indexes of a number of liquids with increase...formulation of what they called the specific refractive energy (now called specific refractive index , where n is the refractive index and...
fiber optics
Book article from: A Dictionary of Computing ...very pure, and by varying the refractive index of the material across the fiber...between glasses of different refractive index ( stepped index fiber...a region of gradually varying refractive index ( graded index fiber...
optical fibre
Book article from: A Dictionary of Biology ...through the sidewalls. In the step-index fibre a pure glass core, with...glass or plastic cladding of lower refractive index. The cladding is usually between...outer wall, has a slightly lower refractive index than the layer inside it...
Snell's law
Book article from: A Dictionary of Earth Sciences ...isotropic media bounded by a common interface . The refractive index n is given by: n = sin i /sin r , and n 1 sin i = n 2 sin r , where n 1 and n 2 are the refractive indices of the two media. The law also indicates that...
indicatrix
Book article from: A Dictionary of Earth Sciences indicatrix ( optical indicatrix , index ellipsoid ) An ellipsoid which represents geometrically the...the axes of the ellipsoid are proportional in length to the refractive indices of beams of light vibrating at right angles along them...
interference filter
Book article from: A Dictionary of Astronomy ...filters are coloured, but interference filters consist of very thin multiple layers of alternating high and low refractive index (e.g. zirconium dioxide, magnesium fluoride) coated on glass. The incident light reflects backwards and forwards...

Related newspaper, magazine, and trade journal articles from HighBeam Research

Effective Refractive Indices of Water and Sulfate Drops Containing Absorbing Inclusions
Magazine article from: Journal of the Atmospheric Sciences; 2/1/2006; ; 700+ words ; ...study the range of visible refractive indices and single-scattering albedos...in the effective imaginary refractive index of up to a factor of 3.4...strongly absorbing, the effective refractive index is often more accurately...
Patent No. 7,593,609 Issued on Sept. 22, Assigned to National Chiao Tung University for Refractive Indices Modulating Method (Taiwanese Inventors)
News Wire article from: US Fed News Service, Including US State News; 9/29/2009; 430 words ; ...developed a method for modulating refractive indices. The inventors were issued...proposes a method for modulating refractive indices of optical fiber gratings...intensities, and whereby the dc index of the optical fiber grating...
Japanese Inventors Develop Diamond-Like Carbon Film with Refractive Indices
News Wire article from: US Fed News Service, Including US State News; 5/21/2007; 478 words ; ...to a "diamond-like carbon (DLC) film having refractive indices distributed in a pattern oriented within the plane...released by the Patent Office, said: "The refractive index structure may be imparted to the DLC film, for...
Glass refractive index determination: Scientific Working Group for Materials Analysis (SWGMAT).(Standards and Guidelines)
Magazine article from: Forensic Science Communications; 1/1/2005; 700+ words ; ...for measuring the refractive index of forensic glass...the refractive index versus wavelength...the refractive index scale is linear...indistinguishable refractive indices. At the match...the observer. Refractive index (RI) for...
Glass refractive index determination.(Standards and Guidelines)(Correction notice)
Magazine article from: Forensic Science Communications; 1/1/2006; 700+ words ; ...surface refractive indices for flat window glasses...computerized refractive index database, Journal...determination of glass refractive indices, Journal of...Underhill, M. Automatic refractive index measurements of glass...Forest, P. R. Precise refractive ...
Limitations of refractive index: contamination can artificially decrease readings.(Process Doctor)
Magazine article from: Circuits Assembly; 4/1/2009; ; 700+ words ; ...cleaning bath in question. The refractive index measuring technique was introduced...coating step. Remember the refractive index is prone to deviation. Given...has a different effect on the refractive index and cumulatively will affect...
Refractive index and fourier transform infrared spectra of virgin coconut oil and virgin olive oil.(Report)
Magazine article from: American Journal of Applied Sciences; 2/1/2009; ; 700+ words ; ...determined the refractive index of virgin coconut oil and...optimized by measuring the refractive index of distilled water...RESULTS AND DISCUSSION The refractive indices of these two virgin oils...are listed in Table 1. The refractive index for virgin olive oil...
Refractive Index and Thickness Analysis of Natural Silicon Dioxide Film Growing on Silicon with Variable-Angle Spectroscopic Ellipsometry
Magazine article from: Spectroscopy; 10/1/2006; ; 700+ words ; The refractive index and thickness of...effects of oxide index and interface layers...of the refractive index and thickness were...obtain more accurate refractive index and thickness...thickness and the refractive index of natural...
Focusing on perfection; Optics.(negative refractive index )
Magazine article from: The Economist (US); 11/19/2005; 700+ words ; ...described as the material's refractive index. This is partly determined by...In the case of glass, its refractive index is about 1.4; this is...boundary, the material would have a refractive index of less than one. If the...
Refractive index measurements perk up
Magazine article from: InTech; 5/1/2002; ; 700+ words ; ...boundary between the two media. The refractive index of a medium is the speed of light...transmission method of determining refractive index. It is useful in the laboratory...reflection and refraction defines the refractive index of the process fluid...