Why a concave mirror is used in torches and car headlights?
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Concave mirrors are used in torches and in car headlights. ... Concave mirrors are used in torches and car headlights because when a source of light is placed at the focus of a concave mirror, a parallel beam of light rays are formed. 2. This helps us to see things upto a considerable distance in the darkness.
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The lens is a convex lens if the letters appear magnified and the lens is concave if the letters appear shortened.
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