Question

A) Normal
B) Principal axis
C) Radius of curvature
D) Focal length
6. A line drawn from any point on a concave mirror to its centre of curvature is called....​

Answer 1

(a) Centre of curvature:-

It is the centre of the sphere of which the spherical mirror is a part.

(b) Radius of curvature:-

It is the linear distance between the pole and the centre of curvature.

(c) Pole :-

It is the mid point of a spherical mirror.

(d) Principal axis :-

It is an imaginary line passing through the pole and the centre of curvature of a spherical mirror.

(e) Principal focus :-

It is a point on the principal axis, where a beam of light, parallel to the principal axis, after reflection, either actually meets (concave) or appears to meet (convex). (f) Focal length is the linear distance between the pole and the principal axis