From: astroelectronic@t-online.de   
      
   Hi all,   
      
   I'd like to know if there exists an anlytic solution for this problem.   
   A beam starts at height = 0 with angle alpha, and passes through air of   
   thickness A and then through a glass window of thickness D. When exiting the   
   window, the beam's height is C.   
   A, D, C and the index of refraction are known. Is there an analytic solution   
   for angle alpha? I think it doesn't exist, but maybe I'm overlooking something.   
      
   http://www.astro-electronic.de/Brechung.jpg   
      
   Thanks,   
   Michael   
      
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