A rainbow forms when sunlight is refracted twice, first when entering a raindrop and then when exiting it, and reflected once within the drop. Sunlight enters a raindrop on the side of the drop facing ...

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. Can rainbows form in a circle? – Henry D., age 7 ...

There are a few things you need to see a rainbow. The main things are water droplets and sunlight. The water droplets need to be illuminated by bright sunshine and they must also be in the right ...