Lecture
This lecture covers wave optics, starting with the scalar theory for optical waves and the wave equation. It then discusses the wave equation in different coordinate systems, linear optics, monochromatic harmonic waves, and the complex representation of wave functions. The lecture also delves into monochromatic plane waves, dispersion diagrams, direction of propagation, evanescent waves in different directions, and the complex wave vector. The instructor emphasizes the importance of the sign condition on the wave vector and temporal dependence in understanding wave propagation.