why are cajole mirror used in solar devices
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Concave mirrors are used in solar devices to collect heat and radiations.Heat radiations from the sun coming from infinity are brought to focus by concave mirror in its focal plane.
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The Sun is a distant object, so the rays coming from it are parallel to the principal axis and are incident on a concave mirror. Then after reflection, they converge to a single point. So, the heat is concentrated at that point which gives better results. Hence, concave mirrors are used in solar devices
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