From: nedlatham@internode.on.net   
      
   ewugkg wrote:   
   >   
   > Light needs a surface to bounce off, otherwise light cannot be detected,   
      
   Not so.   
      
   A stream (ray) of light impinges on what's sensitive to it in the   
   same way as stream of water. If you're in the path from its source   
   you'll detect it; if you're not, it won't affect you. If the stream   
   hits a surface it will bounce, usually in many directions. If   
   you're in one of its paths from that surface, you'll detect it;   
   if you're not, it won't affect you.   
      
   Simple, really.   
      
   ----snip----   
      
   Ned   
      
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