Geometrical optics is a branch of physics that studies light propagation in the geometric framework. Alternatively, it can also be referred to as ray optics, which involves the study of light as rays. Another synonym for geometrical optics is ray tracing, which refers to the tracing of the path of light rays as they interact with various surfaces. Optics can also be approached through physical optics, which involves the study of light as a wave phenomenon. Other related terms include lens optics, which focuses on the properties and behavior of lenses, and image formation, which deals with the formation of images in optical systems.