The focal length of a plane mirror is:

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(B) The relationship between focal length $f$ and radius of curvature $R$ is given by $f = \frac{R}{2}$.For a plane mirror,the surface is flat,which m

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Infinite

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(B) The relationship between focal length $f$ and radius of curvature $R$ is given by $f = \frac{R}{2}$.For a plane mirror,the surface is flat,which means it can be considered as a part of a sphere with an infinite radius of curvature $(R = \infty)$.Substituting this into the formula,we get $f = \frac{\infty}{2} = \infty$.Therefore,the focal length of a plane mirror is infinite.

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