da261bf8   
   XPost: sci.physics, sci.electronics.basics   
   From: phil_a@tpg.com.au   
      
   "RichD"   
   >   
   > This may be a dumb question, but anyway....   
   >   
   > A lens focuses energy, does it not?  That's its   
   > purpose.   So given a large radiating source, the   
   > lens concentrates a dissipating spreading wave,   
   > down to a small area.   
   >   
   > Does this not violate the 2nd law of thermodynamics?   
   > The natural evolution is the radiation spreads,   
   > becoming more disorderly and lower temperature.   
   > The lens reverse this process, concentrating the   
   > energy, with temperature rise.   
   >   
   > And the lens is a passive device, so no exogenous   
   > power source to do the work.   
   >   
   > Ot it could be a parabolic mirror, same thing.   
   >   
   > Explanation?   
      
      
    ** Take a look at Lenz's Law.   
      
      
   ....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)