A pole is vertically submerged in swimming pool, such that it gives a length of shadow \( 2.15 \, \text{m} \) within water when sunlight is incident at an angle of \( 30^\circ \) with the surface of water. If swimming pool is filled to a height of \( 1.5 \, \text{m} \), then the height of the pole above the water surface in centimeters is: \( (n_w = {4}/{3}) \)
