Question

define focus of a convex lens​

Answer 1

Explanation:

Focus of concave lens is the point on the principle axis from which all parallel rays coming from infinity appear to diverge from after passing through the lens.

Answer 2

When parallel rays of light pass through a convex lens the refracted rays converge at one point called the principal focus. The distance between the principal focus and the centre of the lens is called the focal length......☺️❣️