Two beams of light are both the same colour of red. One beam is travelling through air. The other beam is travelling through water. Each beam has a different brightness.

Which quantity is the same for both sets of waves?

The diagram shows a ray of light in air incident on a glass block. Some of the light is refracted and some of the light is reflected. Two angles, p and q, are marked on the diagram.

Which answer gives the angle of incidence (p or q) and states whether total internal reflection occurs (yes/no)?

The diagram shows a ray of light in glass incident on the surface between the glass and air.

What happens if the angle of incidence is made larger than the critical angle for the glass?

The diagram shows how a ray of light refracts when going from air to Perspex. The critical angle of Perspex is c. Which expression is correct?

The letter F is reflected in a mirror. What does the optical image look like?

In the diagram, the mountaineer can hear the stream although he cannot see it. When he is closer to the gully, he can both hear and see the stream. When he is further from the gully, he can neither hear nor see the stream.

Which statement is NOT correct?

Which diagram shows what happens when a ray of white light passes through a prism?

Light travels in a vacuum and then enters a glass block. The speed of the light in the glass block is 2.0 x 10^8 m/s.

Which statement about the speed of light is correct?