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Define focal length and radius of curvat...

Define focal length and radius of curvature of a concave lens.

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Focal length (f) : The distance of principal focus from the optical centre of the lens is called focal length of the lens is called focal length of the lens. The focal lengtth (f) = CF
Radius of curvature : Radius of curvature is the radius of the sphere from which the curved surface is taken part.
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