# Difference between revisions of "Dictionary:Eikonal equation"

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where ''n'' is an index of refraction and [[File:Fgr.gif]] is the wave function. Valid only where the variation of properties is small within a wavelength, sometimes called the ‘‘high-frequency condition.’’ | where ''n'' is an index of refraction and [[File:Fgr.gif]] is the wave function. Valid only where the variation of properties is small within a wavelength, sometimes called the ‘‘high-frequency condition.’’ | ||

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+ | [[Category:Pages with unformatted equations]] |

## Revision as of 13:24, 28 May 2014

(ī kōn’ ∂l) A form of the wave equation for harmonic waves in which the local velocity *V* is compared to a reference velocity *V*_{R} (analogous to comparing a velocity to the speed of light in vacuum):

^{2}=(

*V*/

*V*

_{R})

^{2}=

*n*

^{2},

where *n* is an index of refraction and is the wave function. Valid only where the variation of properties is small within a wavelength, sometimes called the ‘‘high-frequency condition.’’