This photo of the Kootenay Lake Bridge in Nelson, British Columbia [Canada] was taken approximately June 2013. The rainbow is in sharp focus because the raindrops refracting sunlight back at the photographer are falling on the bridge itself. Auto focus usually ignores rainbows and focuses on distant trees and hills. It is hard to get a spectroscopically distinct crystal clear rainbow.
From the geometry of the arc of the inner or 33 degree rainbow, knowing the bridge runs north/south, and the photographer was standing southeast of the bridge, the June sun had risen 40 degrees above the horizon. There is little in the way of air pollution in this part of the world. The sunlight entered the atmosphere over the Idaho panhandle, a pristine area. Nelson BC has some light industry. The air itself is not smoggy, so it doesn't filter the sunlight.
I do not know the camera type, but the CCD "retina" electronically recording the image appears to be operating optimally as all colours are present. The settings may be shifted slightly towards the blue side of the spectrum.
The memory cue for the colours of the rainbow are the seven letters R O Y G B I V or Roy G. Biv (a luminous guy): Red, Orange, Yellow, Green, Blue, Indigo and Violet. Isaac Newton studying refracted sunlight through a triangular prism came up with the seven colours. Some people do not see the violet and others are colour blind in the red/green part of the spectrum. Some CCD cameras pick up extra "colour" in the infra-red and ultra-violet, broading the rainbow. I have seen extra bands of "colour" in the ultra-violet with my eyes.
Most people looking at the rainbow see the beauty of the rainbow and do not analyze colour variation.
In September of 2012, I wrote an article about a book called "Passionate Pinky" by Carol Heywood who has witnessed a band of pink beside the green band in rainbows since August 17-18, 1987, the time of the Harmonic Convergence. I too have seen the pink band and everyone in the group I was with could also see the pink band.
Seeing the pink band, my left brain went into overdrive. From a scientific perspective, the physical universe had been ripped off its foundations. From the right brain the reaction was "Isn't that pretty!"
Quantum certainty evaporated. The electrons shifted and the photons linked to the electrons changed. Likewise the nucleus had shifted. Any shift in the spectrum has huge implacations. Look at rainbows to see the expansion of physical matter.
This photo does not have the pink band beside the green band. It does have a bright violet band beside an extra wide indigo band. In both the inner and outer rainbow arcs, green is very narrow. Green has always been narrow, but in this photo it is almost gone. The camera does pick up the green of the trees in the background so it is not the fault of the CCD. The same raindrops falling onto the bridge create the spectrum images of both the inner (roughly 33 degree) arc and the outer (roughly 55 degree) arc. Due to internal reflection in water and refracting through a nearly spherical droplet, there are variations between the inner and outer arcs. Colours do not correspond exactly. The red and orange are broader in the outer rainbow. Yellow is narrower in the outer arc. The violet band is almost gone in the outer arc. This is an almost normal double arc rainbow but in coming years, the rainbows may have colours in odd places like pink beside green. Colours may appear in the infra-red and the ultra-violet. Colours may shift bandwidths inside the rainbow.
Be aware of what you are looking at, especially rainbows.
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