This document discusses the topics of diffraction and polarization of light. It begins with an overview of different types of diffraction, including Fraunhofer and Fresnel diffraction using single slits, double slits, and diffraction gratings. The document then covers polarization, explaining that light waves are transverse and describing the production and analysis of plane, circular, and elliptical polarization. Examples of applications of polarization are given such as reducing glare using polarizing lenses.