Rainbow

meteorological phenomenon caused by reflection, refraction and dispersion of light in water droplets.

A rainbow is an arc of colour  in the sky that can be seen when the sun shines through falling rain. The pattern of colours start with red on the outside and changes through orange , yellow, green, blue, indigo, and violet on the inside. Sometimes a second, larger, dimmer rainbow is seen.

A double rainbow

A rainbow is created when white light is bent (refracted) while entering a droplet of water, split into separate colours, and reflected back. A rainbow is actually round like a circle. On the ground, the bottom part is hidden, but in the sky, like from a flying airplane, it can be seen as a circle around the point opposite the Sun.

Rainbows often appear after storms, and are popular symbols for peace in many cultures.