The degree that light is bent when it enters a stone. This is measured with a refractometer. Most gems have refractive indices that range between 1.43 and 1.98. Diamond has a refractive index of 2.42, which means it bends light 2.42 times more than air!
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http://gemologyproject.com/wiki/index.php?title=Glossary_of_Terms
A measure of the amount a light ray is bent as it enters or leaves a gemstone.
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http://www.agt-gems.com/Book/Glossary/
The deviation caused by the material when a light beam passes through a transparent specimen.
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http://www.blowmachines.com/glossary1.htm
measure of the bending of a ray of light when passing from one medium into another. If i is the angle of incidence of a ray in vacuum (angle between ... [21 related articles]
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http://www.britannica.com/eb/a-z/r/26
the ratio of the velocity of light in a vacuum to the velocity of light in some medium.
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http://www.chemicalglossary.net/definition/1429-Refractive_Index
The ratio of the speed of light in a vacuum versus the speed of light through another medium. It is always greater than one, unless in a perfect vacuum, as the presence of matter retards the speed of light. When passing through a medium, long wavelengths refract less than short wavelengths, so the r...
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http://www.daviddarling.info/encyclopedia/R/refractive_index.html
at a given point in a propagation medium and in a given direction, the ratio of the speed of propagation of electromagnetic waves in vacuum to the magnitude of the phase velocity of a sinusoidal plane wave in the given direction
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=702-02-19
at a given point in a medium and in a given direction, the velocity of electromagnetic waves in vacuum divided by the magnitude of the phase velocity vector of a sinusoidal plane wave in the given direction NOTE - The refractive index is the real part of the complex refractive index.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-03-21
at a point in a medium and in a given direction, the ratio of the velocity of light in vacuum to the phase velocity of a sinusoidal plane wave propagating in that given direction
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=731-03-11
ratio of the velocity of the electromagnetic waves in vacuum to the phase velocity of the waves of the monochromatic radiation in the medium unit : 1 NOTE - For isotropic media, this index is equal to the ratio of the sines of the angles of incidence (?
1) and refraction (?
2) of a ray passing...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=845-04-101
the ratio of the velocity of light in a vacuum to the velocity of light in some medium.
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http://www.encyclo.co.uk/local/20089
<microscopy> The ratio of the velocity of light in a vacuum to the velocity in some medium. Refractive index generally increases with the atomic number of the constituent atoms. ... (05 Aug 1998) ...
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http://www.encyclo.co.uk/local/20973
the refractive power of a medium compared with that of air (assumed to be 1).
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http://www.encyclo.co.uk/local/21001
Is a numerical value indicating the light bending power of a medium such as glass. The greater the bending power, the greater the refractive index
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http://www.encyclo.co.uk/local/21048
A measure of a clear substance's ability to slow photons, and thereby bend the direction of travel of off-axis rays of light. The denser the material, the more it will slow photons, and therefore bend the direction of travel.
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http://www.encyclo.co.uk/local/21361
The ratio of speed of light in air to its speed within asubstance.
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http://www.encyclo.co.uk/local/22148
Measure of how light is sent back to the eye from the stone. A higher refractive index indicates a brighter stone. Some stones are doubly refractive, which means that they split light into two different paths. Calcite is an example of double refraction; in very clear rhombs, it will double letters on paper if read through.
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http://www.encyclo.co.uk/local/22290
The amount of refraction that takes place in a particular substance, which is a direct connection to the speed of light in that substance. The higher the refractive index, the greater the amount of dispersion, which increase the brilliance of a material. The refractive indices of gems are measured with a refractometer. Gems can be identified b...
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http://www.encyclo.co.uk/local/22291
Ratio of the speed of light in a vacuum to the speed of light in a material.
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http://www.encyclo.co.uk/visitor-contributions.php
(n) Type: Term Definitions: 1. the relative velocity of light in another medium compared with the velocity in air; in the case of air to crown glass, n = 1.52; in the case of air to water, n = 1.33.
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http://www.medilexicon.com/medicaldictionary.php?t=44203
The numerical ratio of the speed of light in a vacuum to its speed in a substance.
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http://www.rexart.com/glossary.html
A technical term used to describe the effect of a lens in causing light rays to bend; important aspect in lens design. Is a numerical value indicating the light bending power of a medium such as glass. The greater the bending power, the greater the refractive index.
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http://www.rodsmith.org.uk/photographic%20glossary/rods%20photographic%20gl
a measure of the magnitude of slowing of light waves by a particular medium
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https://courses.lumenlearning.com/microbiology/chapter/glossary/
index of refraction noun the ratio of the velocity of light in a vacuum to that in a medium
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https://www.encyclo.co.uk/local/20974
As light passes from air into a material it is bent or refracted. The Refractive Index is a measure of the amount that light is bent.
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https://www.encyclo.co.uk/local/22070
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