Yes, Some Rainbows Only Have One Color

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Yes, Some Rainbows Only Have One Color

Post by Guest on Fri Oct 03, 2014 5:15 pm






Not all rainbows are as colorful as their reputation suggests. There are some spectacular monochrome rainbows, when the conditions are right. The cooler shades drop out of the rainbow, leaving bands of yellow, orange, and red. Sometimes the rainbow narrows down to a bright red streak of light.

The rainbow goes monochrome simply because there are no other shades of light to be had. Sunsets cast a red glow on the world because the gas in the atmosphere scatters blue light, filtering it out. This isn't noticeably during the day, except as a slight lemony yellow cast to sunlight, but when the sun is at the far end of the world, with a lot of atmosphere between it and the viewer, the blue gets scattered away. For any rainbow to appear, there needs to be some water, and monochrome rainbows are likely to happen just after rainstorms, or during times of heavy mist. The water droplets further scatter certain wavelengths of light, intensifying the effect. As there is no violet, blue, green, or sometimes even yellow light for the water droplets to refract, the rainbow consists of an arc of red.

Some people also see white monochromatic rainbows. When particularly thick fog or clouds scatters light less precisely than falling rain, light can still form an arc in the sky. The colors get mixed together, and the arc shows up as a large streak of white. It's basically a lit-up cloud. Has anybody here ever seen a monochromatic rainbow?

http://io9.com/yes-some-rainbows-only-have-one-color-1640458484

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Re: Yes, Some Rainbows Only Have One Color

Post by Original Quill on Fri Oct 03, 2014 7:52 pm

Amazing what you can learn flipping through Google.  Did you know you can pee a rainbow?



It's true... http://www.livescience.com/37664-human-urine-colors-rainbow.html


Last edited by Original Quill on Sat Oct 04, 2014 4:31 am; edited 1 time in total

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Re: Yes, Some Rainbows Only Have One Color

Post by Guest on Fri Oct 03, 2014 9:31 pm

Original Quill wrote:Amazing what you can learn flipping through Google.  Did you know you can pee a rainbow?



It's true...http://www.livescience.com/37664-human-urine-colors-rainbow.html

yebbut....THAT is clearly "just a clever photo" since there is also visible a 2nd rainbow (a not uncommon "double bow")
with the colours correctly inverted in order...

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Re: Yes, Some Rainbows Only Have One Color

Post by Original Quill on Sat Oct 04, 2014 4:30 am

But the link is to a real science article, vic.  Have a look.

I had to go back and unhitch it from the ellipsis.

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Re: Yes, Some Rainbows Only Have One Color

Post by Frazzled on Sat Oct 04, 2014 7:28 am

Original Quill wrote:Amazing what you can learn flipping through Google.  Did you know you can pee a rainbow?



It's true... http://www.livescience.com/37664-human-urine-colors-rainbow.html
I can sing a rainbow Smile
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Re: Yes, Some Rainbows Only Have One Color

Post by eddie on Sat Oct 04, 2014 8:09 am

Wow. That first pic is just phenomenal!
I'd love to see that!

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