A capillary tube made of glass of radius 0.15 mm is dipped vertically in a beaker filled with methylene iodide (surface tension = 0.05 $N{m}^{-1}$, density = 667 kg $m^{-3}$) which rises to height h in the tube. It is observed that the two tangents drawn from liquid-glass interfaces (from opp. Sides of the capillary) make an angle of ${60}^0$ with one another. Then h is close to (g = 10 $m{s}^{-2}$).