Question

Why principal focus of a concave mirror is said to be real

Answer 1

Explanation:

Focus is a point where light rays appears to meet. It is called real focus when there is actual intersection of light as in case of concave mirrors.

While in the case of convex mirror light rays are drawn back to meet at a point.

Therefore Concave mirrors have a real focus as it is formed by real intersection of light rays. You can get a clear understanding by seeing the diagram which is attached.

Answer 2

$\huge\mathbb{ANSWER}}$

the principal axis of a concave mirror converge at a specific point on its principal axis after reflecting from the mirror.