As in the solar furnaces concave mirror is used for converting the sun's rays. Can we use convex lens for converging the days?

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Solution

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.

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