5) The radii of curvature are both 28 cm for both curved surfaces of a bi-convex lens constructed of int glass with n = 1.72. Determine its focal length in a_ir and under water. 15 the lens converging or diverging? 6) You are located in the air exactly 6.00 cm above a water surface and see a sh that appears to you to be located exactly 9.00 cm below the water surface. Determine the actual depth of the sh below the water surface, and determine the apparent height above the water surface that you appear to the sh as he looks at you. (Recall n of water is 1.33.)