A convex mirror is a curved mirror with a reflective surface that bulges outward, away from the observer. It is also known as a diverging mirror due to its ability to spread out light rays that strike its surface. Convex mirrors are commonly used in various applications to achieve specific optical effects.

The curvature of a convex mirror causes light rays that strike it parallel to its principal axis to diverge outward after reflection. As a result, the image formed by a convex mirror appears smaller and further away than the actual object. The image is also virtual, meaning it cannot be projected onto a screen.

Due to these unique properties, convex mirrors are often used for safety and security purposes, such as in rearview mirrors for vehicles, where they provide a wide field of view, reducing blind spots and allowing drivers to monitor traffic behind them more effectively. Convex mirrors are also used in retail stores, hospitals, and other public places to enhance surveillance and monitoring, as they allow for a broader observation area with minimal distortion.