Question

Does the imaginary part of the refractive index depends on wavelength

Answer 1

The complex refractive index m(λ) = mr(λ) + imi(λ), where λ is the free-space wavelength, mr is the real part of the refractive index, and mi is the imaginary part. ... The imaginary part of a refractive index is related to the absorption coefficient by 4πmi/λ. For a real refractive index, only scattering can take place.

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