Question

How is a rainbow formed

Answer 1

A rainbow is also called  a color arc, and it is a natural physical phenomenon resulting from the refraction and decomposition of sunlight through a drop of rainwater, the rainbow appears after the fall of the rain and the sun is shining,  the colors in the rainbow are red from the outside and it ranges to orange, yellow and green so the blue is dark blue (indigo), so violet from the inside, sunlight contains many spectral colors, which are rays of different wavelengths, the rainbow usually appears in a semicircular shape and in rare cases it is lunar where the refraction of moonlight that causes it through a drop of water is appropriate with the whereabouts of the moon at those moments. And it appears to the viewer as a result of its dim light, white because the human eye cannot see colors at night.