Question

why are concave mirrors used in solar device's?????​

Answer 1

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. ... The light will reflect up and away from the focal point of a convex mirror.

Answer 2

The reason is that they are concentrator of heat and light in solar furnace. It reflects light towards a single focal length.