From: wolftracks-nospam@sbcglobal.net   
      
   On 3/24/2013 8:09 PM, W. eWatson wrote:   
   > 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?   
      
   Let me simplify this. Of what value or interest are caustics and   
   critical curves?   
      
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