The curvature of the reflecting surface in concave and convex mirrors is described by the terms “concave surface” and “convex surface,” respectively. A concave mirror has a reflecting surface that curves inward, resembling the inner surface of a sphere, with characteristics such as a focal point and focal length. On the other hand, a convex mirror has a reflecting surface that curves outward, akin to the outer surface of a sphere, with its own focal point and focal length. These terms denote the fundamental geometric attributes of the mirror surfaces, influencing the reflection and formation of images in optical systems.