primary rainbow

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

* * *

the most commonly seen rainbow, formed by light rays that undergo a single internal reflection in a drop of water. Cf. secondary rainbow.
[1785-95]

Useful english dictionary. 2012.

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