Why Things Have Colour

What’s missing is what you see

An interactive lesson with 4 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Colour = white light minus what is absorbed (roughly the complementary colour).
• E (eV) ≈ 1240 / λ (nm).

Steps

1. Subtracting from white
2. Make it blue
3. Green leaves
4. Energy of a colour