Question

Relation between refractive index and dielectric constant

Answer 1

Answer:

Both refractive index and dielectric constant are complex functions.

Complex refractive index is given by n(complex) = n – ik

Where k is an imaginary part of complex refractive index (also called extinction coefficient).

Furthermore,

n(complex) = sqrt (complex epsilon) = sqrt (epsilon1 – i*epsilon2)

Where Epsilon1 = n^2 – k^2, is a real part of dielectric function

and Epsilon2 (imaginary part) = 2nk.

For further details I can recommend for example: S. O. Kasap and P. Capper

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Answer 2

There is no relationship between the conductivity and dielectric constant of a material. The capacitance between two conductors will be proportional to the dielectric constant of the material between the conductors, assuming the spacing and area are fixed.