The rainbow of colours you see on a CD comes from:

APolarisation

BReflection only

CAbsorption

DDiffraction

Answer & Solution

Correct answer: D. Diffraction

1. The CD surface has very fine closely spaced tracks. 2. Light bends round them differently for each colour. 3. The colours come from diffraction. _Source: syllabus Physics Part II, Chapter 10, Wave Optics._

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