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^@C` and `0^@`, respectively.It is observed that mercury gets depressed by an amount h in a capillary tube of radius `r_1`, while water rises by the same amount h in a capillary tube of radius `r_2`.The ratio `(r_1//r_2)`, is then close to :
