1. Depth of a lake is 1637m. If a beam of light with an angle of incidence of 60.0º enters the water from the air, what is the horizontal distance between the point where the light enters the water and the point where it strikes the lake's bottom? 2. Snell's Law: ni(sin Өi) = nr(sin Өr) 3. I'm really lost on this one. I know the angle of incidence and index of refracion is 1(?) How do I go about getting horizontal distance. Is there some equation that I'm not considering? Any help would be appreciated.