A Corner Mirror is an optical device designed to reflect light at a 90-degree angle, enabling users to see around corners or obstacles. It consists of two or more mirrors positioned at right angles to each other, creating multiple reflections for improved visibility. Commonly used in security systems, blind-spot mirrors, and periscopes, it helps in surveillance, safety, and navigation in confined spaces. Corner mirrors are also used in optical instruments and scientific experiments to demonstrate light reflection principles. Their ability to provide an extended field of view makes them valuable in both practical and educational applications.