INDEX OF REFRACTION (n) - Ratio of the speed of light in a vacuum to the speed of light through a material: ...
= index of refraction. This usage should be discouraged. refractometer An instrument for measuring the index of refraction of a liquid, gas or solid. refractor = refracting telescope.
index of refraction (NASA SP-7, 1965) (symbol n)
1. A measure of the amount of refraction (a property of a dielectric substance).
refractive index (index of refraction)
By Nick Greene, About.com
Filed In: ...
Helium I has a gas-like index of refraction of 1.026 which makes its surface so hard to see that floats of Styrofoam are often used to show where the surface is.
The absolute index of refraction (abbreviated as "n") of a substance (air, water, glass, etc.) is the ratio of the speed of light in a vacuum to the speed of light in the substance.
The radiance divided by the index of refraction squared is invariant in geometric optics. This means that for an ideal optical system in air, the radiance at the output is the same as the input radiance.
Examples: (1) temperature in Celsius or Fahrenheit measure, (2) index of refraction, (3) dielectric constants. These measurables have arbitrarily chosen âEËœfixed pointsâEâ"¢. Consider a 1 degree uncertainty in a temperature of 99 degrees C.
The index of refraction of a material is the ratio of the speed of light in a vacuum to the speed of light in the material.
For materials with an index of refraction in the common range between 1.3 and 1.8, this velocity requirement corresponds to a minimum kinetic energy of many hundreds of MeV for heavy charged particles.
An effect wherein the index of refraction of a medium is much less than unity so that the phase velocity of electromagnetic waves is greater than the speed of light in the medium.
Scattering is the process by which small particles suspended in a medium of a different index of refraction diffuse a portion of the incident radiation in all directions.
For most materials, however, the index of refraction is slightly less than unity at X-ray wavelengths. This property offers the possibility of using "total external reflection" of X-rays incident on a surface near grazing incidence.
The refractive index [μ, MU] of a medium (or its index of refraction), needed to calculate these effects, is defined as the ratio of the speed of light in a vacuum to its speed in the medium.
The amount of separation is very small, and depends on the thickness of the glass, the index of refraction and the focal length of the telescope.
The bending of electromagnetic radiation as it passes from one medium to another or between parts of a medium that has varying properties. The index of refraction of a substance is the ratio of the speed of light in a vacuum to that in the substance.
 See also: Refraction, Norma, Field, Energy, Planet
|
