1. Light

2. Light travels in a straight line until it hits a new material
Light travels in a straight line until it hits a new material. When it hits the material, some of the light reflects and some is transmitted. If the light bends as it is transmitted, we called this “refraction.”

3. Transmitted light
Refracted light
Reflected
light

4. The shape of the material determines how the light rays will be refracted (bent).

5. Convergent lens

6. Convergent lens

7. Convergent lens

8. What do convergent lenses do?
Convergent lenses bring the light together to a point.

9. The point where all the light rays intersect is called the focus point.

10. Where’s the focus point?

11. Divergent lens

12. Divergent lens

13. Divergent lens

14. What do divergent lenses do?
Divergent lenses spread out the light rays.

15. Here is a diagram of the human eye

16. Convergent or divergent?
What kind of lens do you think the human eye has?

18. Why does the image turn upside down?