why are concave mirror used in solar devices
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concave mirrors focus on one point so used in solar devices in order to focus at a point and make work of it.
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Concave mirrors are used in solar furnaces, because concave mirrors are the only type of mirror that reflects light in toward a single focal point. A flat mirror does not have a focal point. It does regular reflection off all of its points. A convex mirror does have a focal point, but it is an imaginary point that exists behind the mirrored surface. The light will reflect up and away from the focal point of a convex mirror.
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