Linear susceptibility: electrostatics

This lecture covers the concept of linear susceptibility in the context of electrostatics, discussing the alignment of P and E, isotropic and anisotropic materials, and the derivation of macroscopic Maxwell's equations. The instructor explains the model of a damped harmonic oscillator array to represent the response of atoms or molecules to an external electric field. The lecture also delves into the refractive index, absorption, and reflection coefficients, as well as wave propagation in anisotropic media and the index ellipsoid representation of anisotropic materials.