Reflection and refraction of light

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. It is the reflection of light.
Pay attention to the video!





Did you understand the difference between reflection and refraction of light?
I hope so!