<ul><li>Cherenkov radiation from a charged particle moving nearly at the speed of light in a medium with index of refraction n = 1.25. Wavefronts emitted at times 0,1...5 form a shock-front cone with an opening angle alpha=arcsin(0.8).</li>
<li>Caution: this hand-coded image has librsvg-rendering-error-workaround <code>&lt;text font-size="26px" transform="rotate(-36.873)" y="272" x="-4" font-style="italic" fill="blue"&gt;r = vt = ct/n&lt;/text&gt;</code>.</li></ul>
<a href="//commons.wikimedia.org/wiki/User:Pieter_Kuiper" title="User:Pieter Kuiper">Pieter Kuiper</a> and <a href="//commons.wikimedia.org/wiki/User:Inductiveload" title="User:Inductiveload">Inductiveload</a>
4 October 2007 (original upload date)
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Cherenkov2.svg" title="File:Cherenkov2.svg">Cherenkov2.svg</a>