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## Main Question or Discussion Point

I'm curious what models there are for calculating the Electric Susceptibility in crystalline solids and any books that describe maxwell equations in solids well. I'm interested in how to predict index of refraction of materials and the texts are a bit above my head as I haven't really dealt with maxwell equations in solids and have no idea how to calculate the Electric Susceptibility which is key in solving for the index of refraction. Any books or references that could be helpful?