Question
\text { 7. (a) Given that } E=\cos (\omega t-\beta z) \mathrm{a}_{\mathrm{x}}+\sin (\omega t-\beta z) \mathrm{a}_{\mathrm{y}} \mathrm{V} / \mathrm{m} \text { for a planar wave, show that the } Poynting Vector is constant everywhere in a medium. (b) Write down the relation between reflection coefficient and transmissio
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