From: dietz@dls.net   
      
   Robert Schneider wrote:   
      
   > I think that he is probably right.  If reflected photons still have the same   
   > momentum as incident photons, then a perfect mirror won't be able to gain   
   > any momentum.   
      
   Since momentum is a *vector* quantity, they clearly do not have the same   
   momentum before and after reflection.   
      
   	Paul   
      
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