3 ms·

see: http://www.physicsforums.com/showthread.php?t=349697 http://www.physicsforums.com/showthread.php?t=349697

• shasta 16y ago
  Interesting, thanks. It seems plausible that it isn't possible to redirect light from a uniform temperature black body to produce a higher temperature somewhere else. I'll have to think about it more, though. The thermodynamical argument made in that thread seems flawed to me.