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Concave mirrors collect light and create a reflection larger than the focal point, making them useful in automobile headlights, projectors, dentistry, and home use. They are also used in solar heating devices for efficient energy collection.
Sometimes referred to as a converging mirror, the concave mirror is made with a surface that folds inward. Since 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.
This type of mirror is considered a converging device because it collects the light that falls into the bowl created by the inward bulge of the surface. This collection causes light to refocus to a single focal length. The light is collected at different angles, as the concave nature of the bulge allows light rays to make normal contact at different depths at any point on the mirror surface.
The unique reflection created by a concave mirror makes the device extremely useful in a number of different devices. One of the most common applications is with the production of automobile headlights. By positioning the light source in the center of the mirror’s reflector, the result is a parallel beam of light that provides both good visibility for the car’s driver and bright spots that are noticeable to oncoming vehicles.
Similarly, the concave mirror provides a focused beam of light for the projectors. The construction of the lens enables the production of a parallel beam which can be easily directed when the projector is aimed or positioned. Featuring a relatively simple construction, this mirror helps keep the cost of the projectors relatively low while being one of the most durable components in the fixture.
The dental profession also benefits from the use of a concave mirror. It is used to focus light on the area of the mouth that the dentist is working on, providing a clear reflection of the tooth or dentition. This type of mirror can be hand-held or mounted on the dentist’s chair.
A concave mirror can also be very useful in the home. Men can use one while shaving, as the device will provide a magnified image of the beard line. Women often use one while applying makeup for its magnifying properties as well, as the larger image can make detailed makeup much easier to apply.
The field of alternative energies also benefits from this type of mirror. Solar heating devices often make use of concave mirror panels as a means of harvesting solar energy for storage. The bowl-shaped design helps collect the sun’s rays and focus them into a battery system, proving to be far more efficient than other methods of powering solar heating systems.
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