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What is the focal length of a spherical mirror? Give its relation with the radius of curvature.

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i. For a concave mirror focal length is the distance at which parallel incident rays converge. For a convex mirror, it is the distance from where parallel rays appear to be diverging after reflection.

ii. In case of spherical mirrors, half of radius of curvature is focal length of the mirror, f = \(\frac{R}{2}\)

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