The Optics Of Rainbows

By Gustav Strömqvist |  Rainbows are a beautiful physical phenomenon, forming as the result of how the sunlight refracts and reflects inside droplets of water before reaching your eyes. In the visible range, water has a refractive index of n ≈ 1.33 or n ≈ 4/3, with a difference of around 0.0013, or 1%, between violet (400