(B) For a spherical mirror,the relationship between the focal length $(f)$ and the radius of curvature $(R)$ is given by the formula: $R = 2f$.Given t

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(B) For a spherical mirror,the relationship between the focal length $(f)$ and the radius of curvature $(R)$ is given by the formula: $R = 2f$.Given that the focal length $f = 20 \ cm$.Substituting the value into the formula: $R = 2 \times 20 \ cm = 40 \ cm$.Therefore,the radius of curvature is $40 \ cm$.