Question

Label the parts of the ray 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: The centre of reflecting surface of a spherical mirror. It is denoted by A.

Focus: The rays parallel to principal axis are converged at focus by a concave mirror or appear to come from the focus of a convex mirror. Since the given mirror is concave, the focus is denoted by B.

Centre of curvature: The centre of the sphere of which the reflecting surface is a part of. It is denoted by C.

Principal axis: A line passing through pole and centre of curvature. It is denoted by D in the given figure.