Question

7. Define focus, pole and centre of curvature of a concave mirror

Answer 1

in an concave mirror the pole is in the between of the mirror the centre of curvature lies in the same line just front of pole and the focus is in the middle of pole and centre of curvature

Answer 2

The principal Focus of a concave mirror is defined as the point on its principal axis from which a beam of light rays intially parallel to its principal axis appear to converge after reflection from the concave mirror
Pole of concave mirror is the middle point of the spherical surface of the mirror
Centre of curvature of a concave mirror is the centre of the sphere of which the mirror is a part