Define
Centre of curvature
Radius of curvature
Focus of concave mirror
- the geometrical centre of the sphere from which the sphere is cut is called centre of curvature.
- the radius of the sphere, of which the curved surface, (mirror) forms a part, is called the radius of curvature(R).
- A concave mirror has a reflecting surface that bulges inward. these mirrors are called converging mirrors because they tend to collect light that falls on them, refocusing parallel incoming rays towards a focus