Illustration for light dispersal in an apochromatic lens.
<a href="https://en.wikipedia.org/wiki/User:JonesMI" class="extiw" title="en:User:JonesMI">Mike I. Jones</a>
2006-09-28
<a class="external free" href="https://en.wikipedia.org/wiki/Image:Apochromatic_focus_shift_small.jpg">http://en.wikipedia.org/wiki/Image:Apochromatic_focus_shift_small.jpg</a>