primary rainbow

noun

Definition of primary rainbow

: 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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Cite this Entry

“Primary rainbow.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/primary%20rainbow. Accessed 8 December 2019.

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