How can you see a rainbow?The simple answer:
If water droplets are in the air in front of you and the sun is to your back at a low angle, you can see a rainbow. Rainbows do not only form from rain, but mist, dew, fog and ice also work!
The scientific answer:
When light shines into a rain droplet, the light is refracted (a change in direction due to a speed change), then reflected off the back of the drop, and finally refracted once more as it leaves the drop. If there is a double reflection of the light inside the water droplet, a secondary or inverted rainbow is formed.
Rainbows always have the same colors, in the same order from top to bottom: red, orange, yellow, green, blue, indigo and violet. If there is a secondary rainbow, these colors will be reversed.
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