Answer:
Radius refers to the distance between the center of a circle or any other point on the circle's circumference and the surface of the sphere. While on the other hand, the radius of curvature is the radius of the circle that touches the curve at a given point. Also, it has the same tangent and curvature at that point.
To solve a curve's radius, push the straight edge up to the inside of the curve. At the middle of the straight edge, measure the distance from the straight edge to the curve—called “rise on chord” or “mid-ordinate.” Use the geometry: Radius = ½ (rise² + ¼ chord²) / rise.
The radius of the hollow sphere of which the spherical mirror is a part is called the radius of curvature of the spherical mirror. In other words, the distance between the pole and centre of curvature of the spherical mirror is called its radius of curvature.
Explanation: