Double Rainbows
How are double Rainbows formed?
As a ray bounces around inside a droplet of water, some light is diffracted, escapes and is split into its constituent colours, forming a rainbow. Each time the ray gets reflected, the light, and thus the rainbow, gets a bit dimmer.
When this happens two or three times, the final rays exit in the direction of the light source—the sun—and create extremely faint rainbows opposite the original two, which can be seen only while facing away from the sun.














