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Extinction Coefficient
Extinction Coefficient is the fraction of light lost to scattering and absorbtion per unit distance in a participating medium.
The optical properties of the solid are governed by the interaction between the solid and the electric field of the electromagnetic wave. In electromagnetic terms extiction coefficient can be explained as the decay,
or damping of the oscillation amplitude of the incident electric field
The velocity of propagation of a electromagnetic wave through a solid is given by the frequency-dependent complex refractive index N = n - ik where the real part, n is related to the velocity, and k is the extiction coefficient. .
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