A spear fisherman is using m a laser rifle, he is standing in a stream 0.5m deep and fires his laser from a height of 1.5m above teh water. The laser beam refracts when entering the water and strikes a fish swimming along the bottom of the stream. if the laserstruck the water 5m out from the fisherman, how far was his feet from the fish? Did the fisherman have to aim above or below the fish to strike it? Explain?