A coin lies on the bottom of a pool under 1.5 m of water and 0.90 m from the side wall as shown in Figure 2. If a light beam is incident on the water surface at the wall,at what angle relative to the wall must the beam be directed so it will illuminate the coin. Ans: 28.90 The answer I get is 43.29, different with the given answer? May I know which answer is correct actually? Thanks.