Describe the main features of the geocentric model.

Explain how Galileo's observations of Jupiter proved the geocentric model wrong.

How are we able to see stars and planets?

What are the two formulas for the speed of a wave?

Give an example of a transverse wave.

Give an example of a longitudinal wave.

Describe what happens to a light ray as it travels from air into water at an angle.

Draw a rough diagram of how a converging lens works.
(Not a ray diagram)

Describe what is meant by the focal point of a lens.

How can you work out the focal length of a lens.