sentence: Refraction is seen most often when a wave passes from one medium to a different medium.
sentences_before: Examples of waves include sound waves and light waves.
sentences_after: Different types of medium include air and water. When a wave passes from one medium to another medium, the wave will change its speed and its direction. For example, when a light wave travels through air and then passes through water, the wave's speed will slow down and it will change direction.
concept_name: refraction
headings: Refraction
categories: Wave physics