da261bf8   
   XPost: sci.physics, sci.electronics.basics   
   From: jasen@xnet.co.nz   
      
   On 2011-01-24, RichD  wrote:   
   > This may be a dumb question, but anyway....   
   >   
   > A lens focuses energy, does it not?   
      
   sometimes it does.   
      
   > That's its   
   > purpose.   So given a large radiating source, the   
   > lens concentrates a dissipating spreading wave,   
   > down to a small area.   
      
   if aligned correctly it does.   
      
   > Does this not violate the 2nd law of thermodynamics?   
      
   no.   
      
   > The natural evolution is the radiation spreads,   
      
   yes (not sure what you mean)   
      
   > becoming more disorderly and lower temperature.   
      
   no   
      
   > The lens reverse this process, concentrating the   
   > energy, with temperature rise.   
      
   the nearest thing light has to temperature is frequency and   
   that's not reduced by dispersal.   
      
   > 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.   
      
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