Outcomes

Pupils can state and use the Law of Reflection.
Pupils can explain refraction as due to a change of speed in different media.
Pupils can predict the change in direction of a wave due to refraction, including examples using light (including dispersion) and in water, using wave front to explain what is occurring.

Specification References

Ask pupils how a mirror works. Link reflection to smoothness of a surface.
(If you're feeling really brave you could ask why mirrors reflect things right-to-left but not top-to-button.)

Use small bulb, radiant heater, two parabolic mirrors, camera and temperature probe to demonstrate that heat waves are reflected just as light waves are.