What makes a rainbow appear after it has rained?
There is a beautiful, but awe inspiring goddess who makes it rain. Her cloak is long and dark and it billows in the air when she passes. her eyes flash with divine fire. And when she walks over the earth the water of life pours down from the sky to nourish all of life. At the very end of her train are bright jewels sewn into her hem. As the sunlight catches these when she departs they appear in the sky and we call that a rainbow.
Some info on the subject here http://www.branta.connectfree.co.uk/rain… When it rains, the air is filled with raindrops. These raindrops act like a prism. If sunlight passes through the raindrops at the proper angle it is split into its spectrum, which is made up of the colors of the rainbow.
