Optional Practical: Diffraction from a CD
This is an adaptation of a practical I saw on Youtube where a CD is used to perform a diffraction experiment, so thanks go to Steve Dickie. The information on a CD is stored on a very thin shiny spiral track. When light shines on these thin lines it is diffracted in all directions, the light from neighbouring lines interferes constructively when the sin of the angle=λ/d. This means that different colours of light are...