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Prove that under the approximation Poynting vector is directed along VR (r) or s. VR (r) = n(r) s (r) of very short wavelength, the

Prove that under the approximation Poynting vector is directed along VR (r) or s. VR (r) = n(r) s (r) of very short wavelength, the

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Prove that under the approximation of very short wavelength, the Poynting vector is directed along VR (r) or s. VR (r) = n(r)s (r)
Transcribed Image Text:Prove that under the approximation of very short wavelength, the Poynting vector is directed along VR (r) or s. VR (r) = n(r)s (r)
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