A narrow beam of light from a laser travels through air (n = 1.00) and strikes point A on the surface of the water (n = 1.33) in a lake. The angle of incidence is 55°. The depth of the lake is 3.0 m. On the fl at lake-bottom is point B, directly below point A.
(a) If refraction did not occur, how far away from point B would the laser beam strike the lake-bottom?
(b) Considering refraction, how far away from point B would the laser beam strike the lake-bottom?