5. [20] The reflectance of a metal is 80% at normal incidence, and the extinction index...

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5. [20] The reflectance of a metal is 80% at normal incidence, and the extinction index K = 4.0. Find the real part n of the refractive index. 5. [20] The reflectance of a metal is 80% at normal incidence, and the extinction index K = 4.0. Find the real part n of the refractive index.

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