Question

Ans in one word
1-To collect heat radiation in solar device by concave mirror?
2-name the point on the principal axis at which rays to parrallel to principal axis meet after reflection?

Answer 1

1. they converge light to a single point (so focus the heat there)
2. centre of curvature

Answer 2

To collect the heat radiation in a solar device by the concave mirror that helps the light that is going in a flow without being interrupted to suddenly come together and then it increases the intensity of the light an hence it becomes a storage point.

The second question is the centre of curvature, which is the point of the light inversion.