a ball is dropped from a height h, at a polar angle q (measured down from the north pole). how far east is the ball deflected, by the time it hit the ground?

Ascientist notices that an oil slick floating on water when viewed from above has many different colors reflecting off the surface, making it look rainbow-like (an effect known as iridescence). she aims a spectrometer at a particular spot and measures the wavelength to be 750 nm (in air). the index of refraction of water is 1.3