Sometimes referred to as a converging mirror, the concave mirror is configured with a surface that bends inward. Because the center of the curvature in a concave mirror is directed away from any incident light, this creates a reflective image that is typically larger than the actual focal point.

The identification of concave mirrors as a converging device has to do with the fact that a concave mirror collects the light that falls into the bowl created by the inward bulge of the surface. This collection creates a refocus of the collected light into a single focal length. 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 unique reflection that is created by a concave mirror makes the device extremely helpful with a number of different devices. One of the most common applications is with the production of automobile headlights. By placing the source of light at the center of the concave mirror reflector, the result is a parallel beam of light that provides both plenty of visibility for the driver of the vehicle as well as points of light that are apparent to approaching vehicles.

In a similar vein, the concave mirror provides a focused beam of light for searchlights. The concave construction of the lens allows the production of that parallel beam that can be easily directed when the searchlight is swiveled or positioned. Featuring a relatively easy construction, the concave mirror for search lights helps to keep the cost of the units within reason. At the same time, this type of concave mirror is also one of the more durable components on the device.

The dental profession also benefits from the use of the concave mirror. The device is used to focus light onto the area of the mouth that the dentist is working with, providing a clear reflection of the tooth or set of teeth. The concave mirror is used in both hand held equipment as well as mirrors that can be mounted over the dental chair.

A concave mirror can be very helpful around the house as well. Men can enjoy the use of a concave mirror while shaving, since the device will provide a magnified image of the beard line. In a similar application, women can enjoy the services of a concave mirror while applying makeup. The larger image can make the intricate work of applying makeup much easier to accomplish.

Even the field of alternative energy benefits from the present of a concave mirror. Solar heating devices often make use of concave mirror panels as a means of collecting solar energy for storage. The bowl-like design helps to collect rays and focus them into a battery system, proving to be much more efficient than some other methods of powering solar heating systems.