What is the order of colors in a rainbow?
The order of the rainbow is ROYGBIV (red, orange, yellow, green, blue, indigo, and violet). It is caused by a breakup of white light wavelength (all colors) when it hits water. It is refracted as it passes through the water droplets in the sky (moisture after rain) and breaks into 7 different sizes of wavelengths. The largest of the color wavelength is Red and the smallest is Violet. They have the different sizes due to the amount of energy they come with as they travel from the sun to our eyes!
Violet, Indigo, Blue, Green, Yellow, Orange, Red.
You must remember though that red is the longest wavelength in the visible spectrum and appears at the top of rainbows and to the left-hand side on a horizontal wavelength spectrum while violet is the shortest wavelength in the visible spectrum and appears on the bottom of rainbows and to the right-hand side on a horizontal wavelength spectrum. So, reading left to right, the order of the colors is red, orange, yellow, green, blue, indigo and violet:
These are the seven colours on the visible spectrum. Beyond violet are the ultraviolet rays and before red are the infrared rays.