From: hwabnig@.-   
      
   On Mon, 23 Jan 2017 22:17:31 -0800 (PST), ewugkg@gmail.com wrote:   
      
   >Light needs a surface to bounce off, otherwise   
   >light cannot be detected, for example when in a dark room, a light   
   >bulb or cfl is switched on then we can see the furniture, walls   
   >in that room because the light is bouncing/reflecting of those    
   bjects/surfaces.   
   >When a laser pointer is pointed at a screen or at a target that spot can be   
   detected   
   >because the laser beam falls on the target and bounces back and then is   
   detected   
   >by a photosensor.   
   >   
   >But, what if it was possible to detect a spot or point of light in just air,   
   without   
   >the need of a surface for that spot/point to bounce of.   
   >What would be the practical applications of such an invention?   
      
      
   This reminds me of an old question, still unanswered:   
   Where does the light go when I switch off the lamp?   
      
      
   w.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)