This lecture covers the derivation and interpretation of Fresnel coefficients for TE polarization in electromagnetism, focusing on the reflection and transmission of monochromatic plane waves. The instructor explains the Cartesian coordinates in the absence of sources, solutions in the frequency domain, and the dispersion relation. The lecture also delves into the application of duality in the solution, the continuity conditions for Fresnel coefficients, and the polarization perpendicular to the interface.