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Can anyone explain how to go from:
[tex]I_s = \frac{nc\epsilon}{2} |E|^2 [/tex]
to
[tex]I_s = \frac{nc}{8\pi} |E|^2 [/tex]
That means [tex] \epsilon [/tex] is [tex] \frac{1}{4\pi} [/tex]....I can't find that anywhere.
[tex]I_s = \frac{nc\epsilon}{2} |E|^2 [/tex]
to
[tex]I_s = \frac{nc}{8\pi} |E|^2 [/tex]
That means [tex] \epsilon [/tex] is [tex] \frac{1}{4\pi} [/tex]....I can't find that anywhere.