This third course serves as an introduction to the physics of waves and light. Upon completion, learners will understand how mathematical laws and conservation principles describe wave propagation and light in the context of both geometrical and physical optics. Learners will gain experience in solving physics problems with tools such as graphical analysis, algebra, vector analysis, and calculus. This third course covers the Lens Equation, Image Formation, Interference, and Diffraction . Each of the three modules contains complete video lectures, conceptual quizzes, and a set of homework problems. Once the modules are completed, the course ends with an exam. This comprehensive course is similar in detail and rigor to those taught on-campus at Rice. It will thoroughly prepare learners for their upcoming introductory physics courses or more advanced courses in physics.