Simplify the following text for a Grade 6 native English-speaking person.
Original: Refraction of light is the most commonly observed phenomenon , but any type of wave can refract when it interacts with a medium , for example when sound waves pass from one medium into another or when water waves move into water of a different depth .
Simplified: Examples of waves include sound waves and light waves . Refraction is seen most often when a wave passes from a medium to a different medium .