primary rainbow

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primary rainbow [′prī‚mer·ē ′rān‚bō]

(optics)

The most common of the principal rainbow phenomena, which appears as an arc of angular radius of about 42° about the observer's antisolar point; it is the inner of two rainbows, whose light undergoes only one internal reflection, and which is narrower and brighter than the outer, or secondary, rainbow.

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Descartes ray

secondary rainbow

supernumerary rainbow

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