Define focal length and write the relation between radius of curvature and focal length
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The focal length (f) of a lens is the distance between the center of the lens and the point at which the reflected light, of a beam of light travelling parallel to the center line, meets the center line (principal axis). The radius of curvature (r) is the radius of the lens that forms a complete sphere.
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The focal length of a concave mirror is the distance between its pole and principal focus.
The relation bw curvature and focal length:
Centre of curvature = 2 focal length
Or
C= 2F
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