define radius of curvature and focal length with reference to spherical mirror
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A spherical mirror is a part of a hollow sphere that is polished either from inside of from outside.
Radius of curvature is the distance between the center of the hollow sphere of which the mirror is a part of and the pole of the mirror.
The principal focus of a mirror is the point where all parallel rays of beam converge or diverge to appear from that point.
The distance between the principal focus and the pole of the mirror is called the focal length.
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Answer:
The length between pole and centre of curvature of a spherical mirror is called radius of curvature.
The length between pole and focus is called focal length
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