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R The focal length, f = is valid (a) for convex mirror but not for concave mirror. (b) for concave mirror but not for

R The focal length, f = is valid (a) for convex mirror but not for concave mirror. (b) for concave mirror but not for convex mirror. (c) for both convex and concave mirrors. (d) neither for convex mirror nor for concave mirror.

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