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2.3 Indeks bias logamDi dalam logam terdapat banyak elektron bebas; dengan medan listrikelektron-elektron bebas bergerak. Jadi ω o=0, dan indeks bias menjadi:n=Ne21 −ε m(ω2o− iγω)Jika γω p: n ril, gelombang menjalar bebas dalam logam.Untuk ω

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