What does the refractive index of a dielectric material refer to? Why is it complex in some materials? and what the real and imaginary parts refer to? How does it vary with an applied electromagnetic radiation? and how such radiation changes during it propagation through such materials?

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What does the refractive index of a dielectric material refer to? Why is it complex in some materials? and what the real and imaginary parts refer to? How does it vary with an applied electromagnetic radiation? and how such radiation changes during it propagation through such materials?

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