3 /Give a proper answer to the following question required Do any Correction if needed. 1. A beam of light is direction toward the water safface (n=1.33) from below the beam is water-air interface at 20 At what angle it emerge into. incident at the the air? 2-The harmonic Sperical wave is given by the following equation y (r, t) = ( A ) K (Ywt) e wherein the Constant A is called amplitude of any Spherical wave.