Question

Define radius of curvature and focal lenght with reference to spherical mirrors​

Answer 1

Explanation:

The distance between the center of the concave point and the focal point of a mirror or the point where the parallel rays of light meet and the radius of curvature is the distance between the centre of the concave point and the object.

Answer 2

Explanation:

The distance from the pole to the center of curvature is called (no surprise, I hope) the radius of curvature (r). The distance from the pole to the focal point is called the focal length (f). The focal length of a spherical mirror is then approximately half its radius of curvature.