Tanis Truant captured this image from the East Trail side of the Columbia River on Monday when a rainbow graced the valley after a rain storm.
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About rainbow colours:
According to Isaac Asimov, “It is customary to list indigo as a colour lying between blue and violet, but it has never seemed to me that indigo is worth the dignity of being considered a separate colour.
To my eyes it seems merely deep blue.”
The colour pattern of a rainbow is different from a spectrum, and the colours are less saturated. There is spectral smearing in a rainbow owing to the fact that for any particular wavelength, there is a distribution of exit angles, rather than a single unvarying angle.
In addition, a rainbow is a blurred version of the bow obtained from a point source, because the disk diameter of the sun (0.5°) cannot be neglected compared to the width of a rainbow (2°).
Further red of the first supplementary rainbow overlaps the violet of the primary rainbow, so rather than the final colour being a variant of spectral violet, it is actually a purple. The number of colour bands of a rainbow may therefore be different from the number of bands in a spectrum, especially if the droplets are particularly large or small.
Therefore, the number of colours of a rainbow is variable.
If, however, the word rainbow is used inaccurately to mean spectrum, it is the number of main colours in the spectrum.
The question of whether everyone sees seven colours in a rainbow is related to the idea of linguistic relativity. Suggestions have been made that there is universality in the way that a rainbow is perceived.
However, more recent research suggests that the number of distinct colours observed and what these are called depend on the language that one uses, with people whose language has fewer colour words seeing fewer discrete colour bands.
~ Sourced from Wiki