Rainbows aren’t hard to come by or even make for that matter. A couple of droplets o water, sun shine and a mirror and you’ll have your own home made rainbow but nature is full of wonders that always surprise us, yes, even when it comes to rainbows as well. White rainbows, also known as fog bows are another miracle of nature, one which Melvin Nicholson a photographer was able to capture one camera. The picture above is of a White Rainbow taken by photographer Melvin Nicholson while flying over Rannoch Moor in Scotland.
“I was shooting with a friend of mine Scott Robertson when he mentioned that a fogbow was appearing due to the sun burning off the mist,” Nicholson told Mashable. “I moved into position and photographed the tree centrally positioned under the fog bow. Scott also captured a similar image.”
White rainbows look exactly like normal rainbows with the sole exception of the color. Though most people can see a red and blue tinge towards the edge of a white rainbow but the middle is devoid of all color. White rainbows are caused the same way as ordinary rainbows, they can be seen when the sun is at your back and when the sunlight hits the water droplets but unlike ordinary rainbows the only difference is that the droplets in fog are a lot smaller when compared with rain drops.
When the light hits an ordinary raindrop it bends/refracts while passing through it breaking down into various colors in the process. Since a normal droplet of rain is much larger than a fog droplet the light ray has enough to time to stay in the droplet while passing through. On the other hand, a fog droplet doesn’t allow the light ray to spend enough time while passing through the droplet to refract enough to form clear visible colors, causing them to overlap and appear white. This results in a fog bow, which is devoid of all colors except a tinge of red and blue on the edges.