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<p>in terms of either the <a href="page.php?w=electric_field">electric field</a>  or the <a href="page.php?w=magnetic_field">magnetic field</a> , takes the form:</p>

<p>where</p>

<p>is the <a href="page.php?w=speed_of_light">speed of light</a> (i.e. <a href="page.php?w=phase_velocity">phase velocity</a>) in a medium with <a href="page.php?w=Permeability_%28electromagnetism%29">permeability</a> , and <a href="page.php?w=permittivity">permittivity</a> , and  is the <a href="page.php?w=Vector_Laplacian">Laplace operator</a>.  In a vacuum, , a fundamental</p><p>
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