Photographic evidence for the third-order rainbow.

@article{Grossmann2011PhotographicEF,
  title={Photographic evidence for the third-order rainbow.},
  author={Michael Grossmann and Elmar Dr. Schmidt and Alexander Hau{\ss}mann},
  journal={Applied optics},
  year={2011},
  volume={50 28},
  pages={
          F134-41
        }
}
The first likely photographic observation of the tertiary rainbow caused by sunlight in the open air is reported and analyzed. Whereas primary and secondary rainbows are rather common and easily seen phenomena in atmospheric optics, the tertiary rainbow appears in the sunward side of the sky and is thus largely masked by forward scattered light. Up to now, only a few visual reports and no reliable photographs of the tertiary rainbow are known. Evidence of a third-order rainbow has been obtained… 

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