The colour scheme of rainbow is the same as in the spectrum made by the prism.Since red colour bends the least and violet colour bends the most from its original path,so in the rainbow,the red colour appears at the top and the violet colour appears at the bottom.The other coloures appear in between these two colours.
The rainbow is a beautiful, natural phenomenon which continues to inspire people in many ways. The colors of the rainbow are perceived as a set of hues arranged in a specific order. To better remember this order, simply remember the name Roy G. Biv which consists of the first letters of each hue. The seven colors are red, orange, yellow, green, blue, indigo and violet. This is the order from the outside-in of the rainbow's arch. In general, rainbow colors represent diversity and acceptance.
Water Drops Reflect Light
We see a rainbow when rain is in front of us and the sun is located on the opposite side behind us. In this constellation some light of the sun is reflected back to us by raindrops. Light hitting a raindrop also gets bent/refracted at the raindrop's surface and splits up by wavelength. So the reflected light we perceive is not "one ray of white" light anymore but multiple rays of light with distinct wavelength. In "reality" the colors of the rainbow consist of the whole light-color-spectrum but our visual system forms the distinctive bands. The rainbow is partly transparent because some light isn't reflected, but can pass through the raindrops instead.
Color, Light and Energy
The rainbow inspired scientists to further explore the nature of color and light because the rainbow allowed drawing the conclusion that color is somehow connected to light. If we want to better understand color, we must take a closer look at light. And, if we want to better understand light, we must care about energy.
Can you find the two missing links in the relationship between color, light and energy? Yes, more precisely you'd have to say there's a relationship between color, a light processing system, light, a light emitting system and energy.
In this section the light emitting system (light source) is of interest to us because it can influence two properties of light which then make the input for the light processing system.
Light Properties
Light is a form of electromagnetic radiation and the word radiation implies that light travels in waves.
The light waves have interruptions though. This is why we say that a light ray consists of wave-packets, called photons.
Now, the light source, for one, can influence the number of wave-packets (photons) per period of time and, two, the light's wavelength.