Question

with the help of a ray diagram explain the use of concave mirror as solar concentrators

Answer 1

Concave mirror converge the rays of light falling on it. so they are used as solar concentrators in solar cookers, heaters etc. The point where all the reflected rays converge is called as focus. So substance to be heated , should be placed at focus.

Answer 2

Here the substance is placed at the focus ,I.e the place where all the rays of light converge and heat he substance..in this way the substance is cooked or heated