Physics !! due in 2 hours!! need help?

In searching the bottom of a pool at night, a watchman shines a narrow beam of light from his flashlight, h = 1.5 m above the water level, onto the surface of the water at a point L = 2.6 m from his foot at the edge of the pool, Where does the spot of light hit the bottom of the pool, relative to the edge, if the pool is 2.1 m deep?