A small bubble floats on the surface of water. Let ${\mathrm{r}}_1\mathrm{and}{\mathrm{r}}_2$ be the mean radii of curvature of upper and lower part of the bubble respectively. Then, approximate value of ratio $\frac{{\mathrm{r}}_1}{{\mathrm{r}}_2}$ (to nearest integer) is: (Assume surface tension is uniform throughout the bubble)