Question

the centre of the hollow sphere of which the mirror was a part​

Answer 1

Answer:

Curvature

Or

Center of Curvature

U can use anyone of these.

Answer 2

Explanation:

Centre of curvature

Answer. Pole - The geometric centre of the mirror is called pole. The mid point of aperture AB is P, P is the pole of the mirror. Centre of curvature - It is the centre of the hollow sphere which the mirror forms a part.07