What is the physics behind this circular rainbow in the sky?

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SUMMARY

The discussion centers on the physics of a circular rainbow, primarily demonstrating the phenomenon of light refraction. Participants note that the image likely results from light refracting through ice crystals formed from freezing water. It is established that all rainbows appear circular when viewed from an elevated position, such as from a plane or space shuttle. The conversation emphasizes the interplay between light and atmospheric conditions in creating this optical effect.

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  • Familiarity with ice crystal formation
  • Basic concepts of photography from high altitudes
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What physics phenomena is being demonstrated in this picture?

http://teachers.dadeschools.net/jkaelin/images/extra_credit2.jpg
 
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Welcome to PF, D3mon.
The most likely one is refraction of the light, but there would also be the actions of water that caused the ice formation, freezing of the water, etc..

Or is that something other than ice?
 
Looks like a circular rainbow. What ever craft was used to take the picture (plane, space shuttle) had to be fairly high in the sky. All rainbows are circular when viewed from above.
 

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