Early evening rainbows Cu

Igauzu Falls Falls, Argentina/Brazil

Imaged by freelance photographer Ewan Rayment (site) in June 2006.

We rarely see the inverted section of a rainbow. Here we can readily believe that the complete rainbow is a full circle.

The bow also nicely illustrates the effects of drop size. Low in the gorge beneath the falls it is noticeably broader where smaller mist droplets form it. As drops get smaller, diffraction effects become more important and the bow broadens, shrinks a little in radius and its colours become less intense.

©Ewan Rayment , shown with permission.