The power of the lens is inversely proportional to the ______ of the lens.

The ability of a lens to converge or diverge the light is expressed in terms of the power of the lens.

Power is given as, P = $\frac{1}{\mathrm{Focal} \mathrm{length} \left(\mathrm{f}\right)}$

Therefore, we can say that the power of the lens is inversely proportional to the focal length of the lens.