The ratio of the velocity of light in air to the velocity of light in a refractive material for a given wavelength.
The ratio of the speed of light in vacuum to the speed of light in the medium being considered. Also determines how much the path followed by light bends, or refracts, when traveling from one medium to another. Index of refraction is introduced on this page of this module.
This refers to the ratio speeds for light. It is a dimensionless number usually written as n = speed of light in a vacuum/speed of light in a medium = c/v
For a non-absorbing medium, index of refraction () is the ratio of the velocity of electromagnetic radiation in vacuo to the phase velocity of radiation of a specified frequency in the medium.
A property of a medium that measures the degree that light bends when passing between it and a vacuum.
(in'-dex of re-frac'-tion) The ratio of the velocity of light in a vacuum to the velocity of light within a substance. The index of refraction is a function of temperature, pressure and wavelength of light. Birefringent substances, that is, all substances that are anisotropic, have more than one index of refraction. Isometric minerals and amorphous mineraloids are isotropic, that is, their properties are the same in all directions. All other minerals and materials have optical properties that vary with crystallographic direction.
an intrinsic property of a transparent substance, which measures the speed of light in the material compared to the speed of light in a vacuum.
The degree of bending of an RF wave when passing from one medium to another.
This ratio measures the angle of incidence to the angle of refraction of light, with a denser medium bending more light and having a higher index of refraction.
The index of refraction = c/v of a substance characterizes the speed of light in that substance, . It also characterizes, by way of Snell's Law, the angle at which light refracts in that substance.
A numerical value indicating the degree of refraction of a medium, expressed by the formula n=sin i/sin r is a constant which is unrelated to the light ray's angle of incidence and indicates the refractive index of the refracting medium with respect to the medium from which the light impinges. For general optical glass, "n" usually indicates the index of refraction of the glass with respect to air.
Ratio of the velocity of light in one medium to its velocity in a second medium as the light passes from medium to medium. If a medium is crystalline the velocity may depend on the direction of the light with respect to the crystalline axes and the substance may have several indexes of refraction i.e. it may be birefringent. (Also see BIREFRINGENCE.)
An optical property of matter; the speed of light in a vacuum divided by the speed of light in the substance in question.
how much a translucent object refract s light rays passing through it. ( Language Reference) ( Exploration Tool)
A property of matter which determines how a light is bent upon entering or existing the material. A vacuum has an index of one.
A measure of the speed of light in a material.
Synonym of refractive index
The ratio of the velocity of light in free space to the velocity of light in a given material. Symbolized by N.
The ratio of light velocity in a vacuum to its velocity in a given transmitting medium.
A constant number for any material that is an indicator of the degree of the bending of the light caused by that material.
Ratio of the velocity of light in a vacuum to that in the medium. Thus n = c/v and is a number greater than one. Indexes of refraction are a function of the wavelength of the incident light.
The ratio of the velocity of light in one medium to the velocity of light in the next medium.
The ratio of the velocity of light in a refractive material to the velocity of light in a vacuum. nd is the symbol for the index of refraction at a wavelength of 587nm.
A measure of the ability of a lens material to refract a ray of light of a given wavelength. This is usually stated for the wavelength of the helium d-line (587.56 nanometers). The higher the index, the more the refractive power of the lens. For the ophthalmic glasses most commonly in use, n=1.5230. The index of refraction for allyl resin, a plastic most commonly used for eyeglasses, is typically 1.4975.
Ratio of the speed of light in a vacuum to the speed of light in a medium.
Ratio of the speed of light in vacuum to its speed in a material.
is a ratio between the angle of incidence to the angle of refraction of light. It depends upon the density of a medium. A denser medium will have a higher index of refraction and will also bend the light more.
The ratio of light velocity in a free space, to its velocity in a given transmitting media.
The index of refraction (or refractive index) of a material is the ratio of the speed of light in a vacuum to the speed of light through a given material. The index of refraction is generally used in particle sizing applications using laser light scattering.
Characteristic of a medium, such as glass fiber, that indicates the velocity of light traveling through it relative to the velocity of light in a vacuum.
The index of refraction of a medium is the ratio of the speed of light in vacuum to the speed of light in the medium. Also called “refractive index.” See also: fiber, core, cladding, total internal reflection
The ratio of the speed of light in a vacuum to the speed in a media such as glass or air.
The ratio of the speed of light in air to the speed of light in other substances.
Also known as refractive index, it expresses how much light is slowed down, and therefore bent, as it enters a substance. A high index of refraction means that light travels slowly in a mineral and is bent more. Index of refraction often varies as the chemical composition does, so a range is given.
the ratio of the velocity of light in vacuum to that in the refractive material at a specified wavelength
The ratio of the velocity of light in a vacuum to the velocity of light in a given medium.
The ratio of the velocity of light in free space to the velocity of light in a fiber material. Always greater than or equal to one. Also called refractive index.
Indication showing the speed of light in a medium.
The ratio of the velocity of light in a vacuum to the velocity of light in a specific material. Using 1.0 as the base reference, the higher the number, the slower light travels.