Color is Light

That may be a hard concept to understand but because of Sir Isaac Newton, we now understand that all color comes from light. Newton used prisms to prove that white light is actually made up of waves of different colors. This was a radical and controversial idea for the 1660s. At the time, most scientists thought that prisms somehow added color to light. Newton used two prisms to prove that the color was in the light, not in the prism. He placed the first prism in a beam of sunlight and projected the rainbow spectrum - red/orange/yellow/green/blue/indigo/violet - on a wall 22 feet away. To further prove that those colors were components of the light, he inserted another prism into the path of the projected spectrum and reconstituted the beam of light so that it shone white again.

"My heart leaps up when I behold a Rainbow in the sky."
~ William Wordsworth

A rainbow can be defined as a band of colors (from red on the inside to violet on the outside) assembled as an arc that is formed by reflection and refraction (or bending) of the sun's rays inside raindrops. They appear when it is raining in one part of the sky and sunny in another.


Some Interesting Facts about Rainbows:

When you see a rainbow...
it is after rain. The sun is always behind you and the rain in front of you when a rainbow appears, so the center of the rainbow's arc is directly opposite the sun.
Most people think...
the only colors of a rainbow are red, orange, yellow, green, blue, indigo, and violet, but a rainbow is actually made up of an entire continuum of colors—even colors the eye can't see!
We are able to see the colors of a rainbow because...
light of different colors is refracted when it travels from one medium, such as air, and into another- -in this case, the water of the raindrops. When all the colors that make up sunlight are combined, they look white, but once they are refracted, the colors break up into the ones we see in a rainbow.
Every person...
sees their own "personal" rainbow. When you look at one, you are seeing the light bounced off of certain raindrops, but when the person standing next to you looks at the same rainbow, they may see the light reflecting off other raindrops from a completely different angle. In addition, everyone sees colors differently according to light and how their eyes interpret it.
You can never...
actually reach the end of a rainbow, where a pot of gold supposedly awaits. As you move, the rainbow that your eyes see moves as well, because the raindrops are at different spots in the atmosphere. The rainbow, then, will always "move away" at the same rate that you are moving.

Also See:
Rainbow