OVER THE RAINBOW
Nine different types of rainbow
Rainbows are caused by water droplets in the atmosphere. When light passes through the droplets, it bends and spreads out, forming a band of colours.*
1 Primary rainbow
The classic. The colour sequence of a primary rainbow is: red, orange, yellow, green, blue, indigo, violet.
2 Double rainbows
This is when a faint, secondary rainbow appears above the first one. They’re caused by light reflecting twice inside the raindrop. This second reflection** causes red to be on the inner section of the arch, with violet on the outer section.
3 Twinned rainbows
These are the rarest type of rainbows, when two rainbows start from the same base but then split to form a primary and secondary arc across the sky. They are usually caused by…