When light rays strike a concave mirror, the inward curve of the reflective surface directs them to a focal point.
A concave mirror’s inward-curved surface reflects parallel incident rays at different angles. All reflected rays converge at the focal point (F). The focal length is the distance between the center of the mirror and the focal point. The angle of reflection depends on the normal (perpendicular line) at each point on the mirror’s surface. Each incident ray reflects according to the law of reflection, but the curvature causes them to converge inward.
Convergence has several practical applications, including: