Question

Why are concave mirrors used in solar devices

Answer 1

concave mirrors used in solar devices to concentrate or to focus the suns rays in a small region

light from infinity falls on the mirror and the image will form at the focus resulting in more heat being generated

Answer 2

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Concave mirror is also known as converging mirror because of its ability of focusing parallel rays at a single point anywhere on its focal plane . This property of concave mirror is used in solar devices. Parallel rays from the sun falling on the concave mirror a solar device are focused at the particular point to generate a lot of heat required for the proper functioning of the device