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Firstly, you can see some coloured rays leaving a black wheel. After that, a person fills the container with water. If the wheel is turned to the left, light passes from water to air and changes its direction.When light goes from a dense matter(water) to another sparse matter(air), light seems to bend.**It is the refraction of light.** If the wheel is turned to the right, light hits the edge between water and air. At this moment light is reflected inside the water as well as a mirror.You can observe this process every time a ray gets the surface of water.
 * I t is the reflection of light. **