The ratio of surface tensions of mercury and water is given to be 7.5 while the ratio of their densities is 13.6. Their contact angles, with glass, are close to $135^{\circ}$ and $0^{\circ}$, respectively. It is observed that mercury gets depressed by an amount $h$ in a capillary tube of radius $\mathbf{r}_1$, while water rises by the same amount $h$ in a capillary tube of radius $r_2$. The ratio, $\left(r_1 / r_2\right)$, is then close to: