Final answer:
Light passing from air into water is an example of refraction, where light waves change direction as they move between two media with different refractive indexes.
Step-by-step explanation:
When light passes from one medium to another, such as from air to water, it undergoes a phenomenon called refraction. Refraction occurs when light waves change direction as they travel from one medium to another with a different refractive index. In this case, the light is bent as it moves from air into water, causing the appearance of objects in water to be distorted.
Learn more about Refraction of light