A rainbow happens when raindrops and sunshine cross paths. Sunlight has many colors, that add together to make white illumination. Then sunlight enters water drops, it reflects off inside surfaces and passes through the droplets, the light then separates into components of colors, similar to the effect of a glass prism. Falling water drops actually flash colors to the observer for just a moment, before another drop takes its place.
“I have set my rainbow in the clouds, and it will be the sign of a covenant between me and the earth… Never again will the waters become a flood to destroy all life.” (Genesis 9:13,15).
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