Insulators have different abilities to make dipoles {polarizability}| {polarization, electricity}. If polarization is more, refraction index is more. Polarization K is refractive index n squared: K = n^2. Metal has free electrons and cannot make dipoles. Empty space has no charges and cannot make dipoles.
Physical Sciences>Physics>Electromagnetism>Conductivity>Insulator
5-Physics-Electromagnetism-Conductivity-Insulator
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Date Modified: 2022.0224