Question

The geometric center of a spherical mirror is called

• A. Pole of the mirror
• B. Centre of curvature
• C. Radius of curvature
• D. Focal point

Answer 1

The correct option is B

Centre of curvature

Explanation for the correct option:

B: Centre of curvature

1. The geometric centre of the hollow sphere of which the spherical mirror is a part is called the centre of curvature of the spherical mirror.
2. It is denoted by C.

Explanation for the incorrect option(s):

A: Pole

The centre of the spherical mirror is called its pole. It is denoted by P.

C: Radius of curvature

The radius of the hollow sphere of which the spherical mirror is a part is called the radius of curvature of the spherical mirror.

D: Focus

If a beam of light parallel to the principal axis falls on a concave mirror, all the rays after reflection meet at a point. This point is called the focus (F) of the mirror.

Hence, option B is correct.