In Eastern cultures, a double rainbow is considered a sign of good luck. To leprechaun believers, they know that the leprechauns left his pot of gold for those that believe. Lastly, In the Bible (Genesis 9) a rainbow is part of Noah’s story in which God promises never to create another destructive global flood. Overall, a double rainbow is pretty special! T
For my science friends…because I know you want to know how this happens. Here’s the scientific info on double rainbows in 10 easy (sort of) steps:
- In a single rainbow, sunlight spreads into a spectrum of colors from red to violet. But in a double rainbow, the colors are inverted, with red appearing on the inside and violet on the outside.
- All rainbows require the presence of the sun and rain in order to form. The sun must be to the viewer’s back and the rain must be falling ahead of the viewer.
- As sunshine breaks through the clouds and beams towards the raindrops, some of the light encounters the raindrops and bends – this process is called refraction.
- When the light refracts, the process causes the sunlight to separate into different wavelengths. These different wavelengths correspond to different colors: red and orange correspond to longer wavelengths, while blue and purple correspond to shorter wavelengths.
- The refracted lightwaves then bounce – or reflect – off of the circular edge of the raindrop, and then they refract again as they exit the raindrop and travel through the air.
- Because raindrops are relatively round when the sunlight refracts through them, the visual result is a spherical arc that soars all across the sky.
Double Rainbow- How Did that Happen?
- The first and brighter rainbow is called the primary rainbow. This rainbow is created by the process described above,and only requires the light to reflect off the raindrop once before refracting out of the raindrop.
- The second and more faint rainbow is called the secondary rainbow. It occurs when refracted light does not escape the raindrop afterbeing reflected the first time. Instead, the refracted light reflects off the raindrop’s surface a second time as well, producing a secondary rainbow with its colors reversed compared to the primary rainbow.
- Fewer light rays are available to undergo the additional refraction process, so the resulting secondary rainbow appears less vivid.
To all my blog friends:
I wish for you a Double Rainbow 2019 filled with luck, fortune and sunny days!