n_1/n_2=sin(θ_2)/sin(θ_1)

The demonstration of refraction using a ripple tank is tricky, and it is a good idea to practise this.

Teaching Guidance 16-19

Demonstration: Refraction at an air-water interface and total internal reflection.

Practical Activity 14-16

Demonstration: Shows refraction is caused when plane waves change speed as a result of a change in the depth of water in a...

Practical Activity 14-16

Why does the angle of incidence = the angle of reflection ? One answer explored earlier is an appeal to the rules about rays...

Physics Narrative 14-16

This episode starts from the phenomenon of refraction and moves on to Snell’s law.

Lesson 16-19