1. Title ??? What is happening here? Keywords: Refraction Lenses
All: ???
Most: ???
Some: ???
interface
What is happening here?

2. Refraction

3. Refraction happens whenever light travels from one transparent substance to another. It only takes place where the two substance meet (at their interface).
The change in speed causes a change in direction.

4. Practical
air
normal
glass
Ray box

5. NO NOT look directly at the bulbs

6. Lenses

7. What is refraction
Why do cameras need lenses?

8. Refraction All: Describe some uses of a lenses
Most: Describe refraction
Some: Explain how concave and convex lenses work