Define radius of curvature and focal of sperical mirror
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radius of curvature-
the radius of a circle which touches a curve at a given point and has the same tangent and curvature at that point.
focal length-
the distance between the centre of a lens or curved mirror and its focus.
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the radius of curvature is the length equal to the radius of the sphere of which the mirror is part of
and focal length is equal to the half of the radius of the curvature.
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