How is it that the order of colors of the rainbow is always the same
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The color of order  

The pattern of light is always the same in a primary rainbow because each color is reflected at its own particular wavelength. In a primary rainbow, the colors will be in the order of red, orange, yellow, green, blue, indigo and violet.

Explanation:

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 Red, Orange, Yellow, Green, Blue, Indigo and Violet

answer; hypnagogic sensations)