Final answer:
Refraction is the phenomenon in which light waves change their path or direction as they pass from one medium to another. The change in the speed of light as it travels through different materials causes its bending.
Step-by-step explanation:
Refraction is the phenomenon in which light waves change their path or direction as they pass from one medium to another. When light passes through different mediums, such as from air to water or from air to glass, it undergoes refraction. The change in the speed of light as it travels through different materials causes its bending. The angle at which the light bends depends on the refractive index of the two materials.