primary rainbow
noun
: a rainbow in which the effective rays are refracted on entering each drop, reflected from its interior surface, and refracted again on emerging to pass to the observer's eye and in which the red is seen on the outside edge of the bow
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“Primary rainbow.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/primary%20rainbow. Accessed 29 Nov. 2024.
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