Question

1) Define the principal focus of a concave mirror ​

Answer 1

Answer:The principal focus of the concave mirror is an point on the principal axis of the mirror, where incident rays of light, parallel to the principal axis, after reflection from mirror surface, intersect each other .

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.