The primary application of concave mirrors in torches, searchlights, and vehicle headlights is to focus and direct light efficiently. Concave mirrors are used to gather and reflect light rays parallel to the principal axis toward a specific point, known as the focal point. This property allows these mirrors to create a concentrated and powerful beam of light. In torches and headlights, concave mirrors help maximize the intensity of the emitted light, providing a focused and more luminous output. Similarly, in searchlights, the ability to concentrate light in a specific direction enhances the range and effectiveness of the beam for long-distance illumination.