Double rainbow and supernumerary rainbows on the inside of the primary arc. The shadow of the photographer's head at the bottom of the photograph marks the centre of the rainbow circle (the antisolar point). A rainbow is an optical phenomenon caused by refraction, internal reflection and dispersion of light in water droplets resulting in a continuous spectrum of light appearing in the sky. [1 ...

All about rainbows. What causes a rainbow, why is it curved? What are the rainbow colors, how does a double rainbow work, and what's at rainbow's end?

Discover rainbow facts, including how rainbows form, why they appear in the sky and what causes double rainbows.

Rainbow, a series of concentric colored arcs that may be seen when light from a distant source—most commonly the Sun—falls upon a collection of water drops—as in rain, spray, or fog.

Photograph Rainbow River A rainbow is a multicolored arc made by light striking water droplets. The most familiar type rainbow, including this one in southern Chile, is produced when sunlight strikes raindrops in front of a viewer at a precise angle. The colors on a primary rainbow are always in order of their wavelength, from longest to shortest: red, orange, yellow, green, blue, and violet ...

Here’s everything you need to know about rainbows to impress your friends (or search for a pot of gold).

Rainbows form when sunlight is refracted, internally reflected and refracted again by raindrops, splitting white light into colours that emerge at ~40°–42° from the antisolar point.