A reflection rainbow may be produced where sunlight reflects off a body of water before reaching the raindrops (see diagram and [http://www.atoptics.co.uk/rainbows/bowim6.htm] ), if the water body is large, quiet over its entire surface, and close to the rain curtain.
Where sunlight reflects off a body of water before reaching the raindrops (see diagram), it may produce a reflection rainbow (see photo at the right), if the water body is large, and quiet over its entire surface, and close to the rain curtain.