Incident ray Refracted ray Figure 20-17 Illustration of Snell's law: n sin 0 = n sin 02. When light passes from air into any medium, the greater the refractive index of the medium, the smaller is 02. 0 10 Reflected ray Refractive index = n Refractive index = n Visible light travels from air (medium 1) into water (medium 2) at a 45 angle (0, in Figure 20-17). At what angle, 02, does the light ray pass through the water