Reflexion of a plane wave by a cylindrical mirror with parabolic base
<a href="//commons.wikimedia.org/w/index.php?title=User:Jean-Michel_Courty~commonswiki&amp;action=edit&amp;redlink=1" class="new" title="User:Jean-Michel Courty~commonswiki (page does not exist)">User:Jean-Michel Courty~commonswiki</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>, image created with PovRay