Question

Is it possible to see primary and secondary
rainbows simultaneously? Under what
conditions ?​

Answer 1

Answer:

Hey mate, hope this answer helps you...

Explanation:

In summary, although it is very rare, it is possible for the naked human eye to see four natural rainbows at once in the sky, consisting of: The primary rainbow (single reflection inside the raindrop) from direct sunlight. The secondary rainbow (double reflection inside the raindrop) from direct sunlight.

Answer 2

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Yes, sometimes when a primary rainbow is seen, a fainter secondary rainbow is seen higher in the sky. The two arches are concentric.

The primary bow arises from sunlight entering the tops of drops properly located and undergo internal reflection once before refracting out. The secondary bow arises from sunlight entering the lower halves of the drops and undergo two internal reflections before refracting out. Since these reflections and refractions are all partial, only a small fraction of the incident intensity is deviated in the direction of the observer. Hence, to see both the bows simultaneously, there must be dark rain-bearing clouds in the 40° - 55° range above the horizon and sufficiently intense sunlight must be incident on them from behind the observer, a few hours before noon or a few hours after noon.