How Do Rainbows Form?

SciShow explains how three important ingredients — sunlight, water, and you — interact to create the illusion of a rainbow. The colorful details are inside!
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Sources:
http://scienceline.ucsb.edu/getkey.php?key=1542
http://science.howstuffworks.com/nature/climate-weather/storms/rainbow2.htm
http://www.physicsclassroom.com/class/refrn/Lesson-4/Rainbow-Formation
http://wwwp.cord.edu/faculty/manning/physics215/studentpages/genamahlen.html
http://van.physics.illinois.edu/qa/listing.php?id=2195