A diverging lens is a type of lens that spreads light rays outward, causing them to bend away from the optical axis. This lens is thinner at the centre than at the edges and is also known as a concave lens.
In photography and optics, diverging lenses are used to reduce the size of an image, correct optical aberrations, or spread light for special effects. They are commonly found in combination with other lenses in complex optical systems, including cameras, projectors, and magnifying instruments, where they help control focus, image formation, and light path.