Video and lesson investigations on the topic of refraction. Key concepts include:
- Water changes what we see (it bends the light).
- The light coming from an object underwater is bent (refracted) at the water’s surface.
- Objects in water appear to be in a different place from where they really are.
- The apparent shift in position depends on both how far the object is below the surface of the water and the position from which it is viewed.
- Light travels more slowly through water or glass than it does through air because water and glass are more dense than air.
- As light slows down, it also changes direction slightly.
- This difference in the speed of light makes objects that are half in the water and half in the air look ‘bent’.
- This phenomenon is called ‘refraction’.