Hi MANG2004, s,eld@
XX]5T`D
I am curious about your calculation, too. Plus, the definition of σ refers to 1/e^2 width not the FWHM. Even your calculation/defintion is correct. I have a doubt that it will work when the specualr incident ray angle is not normal......... xB?S#5G}
Gl?P.BCW.&
For thsoe who knows it better, please have some input. I am rather curious, too!! Thanks!!