Optical physics is a branch of physics that focuses on the study of light and its interactions with matter. It encompasses the study of the behavior and properties of light, the generation and manipulation of light waves, and the use of light in various applications such as imaging, communication, and sensing. Research in optical physics often involves the study of electromagnetic radiation in the visible, ultraviolet, and infrared spectrums, as well as the development of new technologies and materials to control and manipulate light for practical purposes. Key areas of research in optical physics include the development of lasers, fiber-optic communication, optical sensors, and the study of optics in various materials and systems.