Dear Faraj,
Your approach seems correct to me. Could you specify what exactly your
problem is? What do you get when you perform the calculation that you
explain here?
Sebastian Schulz
--
Sebastian A Schulz
School of Physics and Astronomy,
North Haugh,
St Andrews,
Fife,
KY16 9SS
Office: +44 1334 467336
www.st-andrews.ac.uk/photonics
The University of St Andrews is a charity registered in Scotland : No SC013532
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