What happens to a light wave traveling through air when it strikes a boundary with water at a 45 and Acirc and deg angle?

When a light wave traveling through air strikes a boundary with water at a 45° angle, it will change speed and direction due to a change in the medium's refractive index. This phenomenon is called refraction. The angle of refraction depends on the refractive indices of air and water according to Snell's law.