(C) The power of a lens $(P)$ is defined as the reciprocal of its focal length $(f)$ in meters.Mathematically,$P = \frac{1}{f}$.The dimension of focal

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(C) The power of a lens $(P)$ is defined as the reciprocal of its focal length $(f)$ in meters.Mathematically,$P = \frac{1}{f}$.The dimension of focal length $(f)$ is $[L]$.Therefore,the dimension of power $(P)$ is $\frac{1}{[L]} = [L^{-1}]$.Thus,the correct option is $C$.