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Q.

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

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Detailed Solution

i) Radius of curvature (R) : The radius of curvature of the surface of a lens is the radius of the sphere from which it forms.
ii) Focal length (F) : It is the distance between the principal focus (F) and the optical centre (C) of the lens.

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