Question

principle focus and focal point are same?

Answer 1

In the convex case, the point the rays all converge is called focus, and the distance from this point to the lens is the focal length. Then they would converge , on the same side of the lens as the original parallel . This is point, where the virtual rays converge , is the focal point.

Answer 2

yes they are the same that is the point where the rays of light meet after convergence or divergence from the mirror/lens