Question

Define radius of curvature​

Answer 1

Define radius of curvature.

The radius of the hollow glass sphere of which the spiracle mirror was a part is called radius of curvature .

$\sf\blue{More\:Info\:-}$

Centre of Curvature : the centre of a curvature of a curved mirror is defined as the centre of the hollow glass sphere of which the curved mirror was a part.

Pole : the pole is defined as the geometric centre of the curved mirror.

Principal axis : the imaginary line passing through the Pol P and the centre of the curvature C.

Answer 2

• The radius of the hollow glass sphere of which the spiracle mirror was a part is called radius of curvature .
• Centre of Curvature : the centre of a curvature of a curved mirror is defined as the centre of the hollow glass sphere of which the curved mirror was a part.

HOPE this helps you ☺️