When a light wave passes at an angle from water into air, it experiences refraction and bends away from the normal. What is the primary cause of this change in direction?
A change in the frequency of the light wave
A change in the amplitude of the light wave
A change in the phase of the light wave
A change in the speed of the light wave
100 exam-style questions on CIE IGCSE Physics 3.2.2 Refraction of light. Each one has a worked solution and a mark scheme showing where the marks go.