From: astroelectronic@t-online.de   
      
   Phil,   
      
   I have a few questions about your book.   
   The first question is about formula 6.17 on page 204. If I set theta to 90°,   
   then all four matrix elements become zero, which means the analyzer passes no   
   light at all. I think that can't be correct.    
   The next question is about formulas 6.20 to 6.24. Why are polarization   
   _states_ described by matrices, and not by vectors?   
   The last question is about formulas 6.22 and 6.23. Might it be possible that   
   in 6.22 a factor of 2 is missing in the denominator? Please compare with   
   Eugene Hecht: Optics, table 8.5 on page 323   
      
   Thanks,   
   Michael   
      
   --- SoupGate-Win32 v1.05   
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