Dictionary:Eikonal equation

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

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle \nabla^2\phi=\left(\frac{V}{V_R}\right)^2=n^2 } ,

where n is an index of refraction and 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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Eikonal equation
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