From: wolftracks-nospam@sbcglobal.net   
      
   I've searched the web for caustics and optics, but mostly see pictures   
   of them. They seem to have some positive use. In some fashion they seem   
   to magnify. They seem to be somehow related to critical curves, whatever   
   they are. Both seem to be helpful in gravitational lensing or in other   
   areas of optics. How?   
      
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