Colorless Rainbow
Now, what do you think when you hear a rainbow. Lots of beautiful colors right? Well, you may be thrilled to see this fogbow, also called white rainbows, cloud bows, or ghost rainbows. The fogbow is a rare phenomenon that makes an appearance on foggy days. You can see the fogbow only if there are small drops of water in the sky and you stand facing the fog with your back towards the sun. But this is not the end. You can also spot one of these by moonlight. It is referred to as a moonbow. Sounds exciting, right?
How is it caused?
As reported by NASA, these fogbows are colorless due to the presence of relatively smaller water droplets. It is so small that for this, the quantum mechanical wavelength of light becomes notable which results in smearing out the colors that would be created by larger rainbow water droplets which act like small prisms reflecting sunlight. But in fogbows, the water droplets are very small these are not capable enough to reflect and refract sunlight.
But the fun doesn’t end here. We know that as days go, nights come. So the sun is not only the source of light. Moon is also a source of light. So, we can observe a fogbow also on a moonly foggy night. This fogbow is more white and less colorful due to the less intensity of moonlight and sunlight. And this is nothing but the moonbow.
So, indeed, we know very little of this diversified world. But if we keep on exploring beauties like this, it will be great fun. So we hope, we can come across a fogbow at least once in our life enjoy its scenic beauty.
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