Concave mirrors are used in torchlight as a reflector.why?
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Concave mirrors are used as reflectors in torchlight because as per the rules of image formation by a concave mirror when an object is placed at focus the image is formed parallel to the principal axis, as a result, a parallel beam of light rays are formed due to its parabolic shape.
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Concave mirrors are used as a torchlight reflector due to its ability to diverge light.Diverging of torchlight increases the area under light hence increases visibility even further
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