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When there is a bright rainbow it is worth looking out for additional bows inside the primary. These supernumerary bows are caused by interference and are more common toward the top of the bow. |
When conditions are just right there may be several bows inside each other. In this close up two supernumeraries are visible. |
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Supernumerary bows are easy to create with a garden spray, partly because of the smaller drop size but also because the sizes are more even. The brightening inside the primary and outside the secondary is very obvious here. |
Apart from producing stronger bows inside the primary the spraybow can occasionally produce a supernumerary outside the secondary. This is very rare in a natural rainbow. Here this shows up as the faint orange band along the left edge of the secondary. |
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Supernumerary Bows |
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