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The concave  mirror is a  converging device which   collects the light that falls into the bowl created by the inward bulge of the surface. It is made with a surface that bends inward. Because the center of the curve is directed away from any incident light, it creates a reflection that is typically larger than the actual focal point. The light is collected at different angles, since the concave nature of the bulge allows the light rays to make normal contact at differing depths at each point on the surface of the mirror.The focal length of concave mirror is always negative.

This  lense  is extremely useful in a number of different applications like  production of automobile headlights, solar panels etc.