Rainbow
Rainbows are curved bands of colored light that appear in the sky. We see rainbows when the sun shines on raindrops. Sometimes both ends of the rainbow seem to touch the ground.
Rainbows usually appear at the end of the day, after a storm has passed. To find a rainbow, turn away from the sun, face the shadow of your head, and look up. If there is a rainbow, you will see it less than halfway between your shadow and a point straight above your head.
Usually, people see a primary (PRY mehr ee) rainbow, or main rainbow. It is red on top of the curve and violet on the inside, with other colors in between.
Sometimes a second, fainter rainbow appears higher up. This rainbow is violet on top and red on the inside.
Rainbows appear because of the way light behaves. White light is made up of all the other colors of light. Each color has light waves of a different length.
White light bends when it passes through a kind of glass called a prism (PRIHZ uhm). Light waves of some colors bend more than others.
This makes the white light separate into bands of colored light.When the light passes through raindrops, it separates in the same way. The bands of colored light make up the rainbow that people see.