Question

Label the parts of the diagram.

• A. A – centre of curvature; b – focus; C – pole; D – radius of curvature
• B. A – focus; b – centre of curvature; C – principal axis; D – pole
• C. A – pole; b –focus; C – centre of curvature; D – principal axis
• D. A – principal axis; b – pole; C – radius of curvature; D – focus

Answer 1

The correct option is C

A – pole; b –focus; C – centre of curvature; D – principal axis

Pole: centre of reflecting surface of a spherical mirror.

Focus: rays parallel to principal axis are converged at focus by a concave mirror or appear to come from the focus of the mirror.

Centre of curvature: the centre of the sphere of which the reflecting surface is a part of.

Principal axis: A line passing through pole and centre of curvature.