2. (a) Derive the refractive index n and the extinction coefficient k of a material in terms of dielectric constants &₁
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2. (a) Derive the refractive index n and the extinction coefficient k of a material in terms of dielectric constants &₁
2. (a) Derive the refractive index n and the extinction coefficient k of a material in terms of dielectric constants &₁ and 2 and then discuss how will you find other optical parameters by knowing n and k. -15 +190