Define focal length and radius of curvature of a concave lens
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the radii of the two spheres of which the lens surface are a part are known as radius of curvature
the centre of the two spheres is known as centre of curvature
the centre of the two spheres is known as centre of curvature
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The radius of the hollow glass sphere of which the spiracle mirror was a part is called radius of curvature .
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