A beam of white light passes from air into a semi-circular acrylic block. The light splits into a spectrum of different colours.
Explain, in terms of speed, why the white light disperses into different colours inside the acrylic block.
24 exam-style questions on Edexcel GCSE Physics 5.1 Reflection, refraction and lenses (physics only). Each one has a worked solution and a mark scheme showing where the marks go.