The image above is a scanned paper, that I had drawn. It is a model showing the certain spectrum colors you can see when looking through the colors labeled at the top of the picture.
This is a model showing you the nanometer ratings for all of the different colors. In this model it points out how the purple has a shorter frequency than the red. Meaning the wavelengths are closer to gather and happening faster that the red light. This is a hard concept to grasp, but one way you can think of it is like a sound wave. The higher pitch notes are like the purple colors, they are traveling faster and have a shorter frequency. Then the really low notes are like the red color, drawn out and longer frequency. Light is definitely a lot more complicated the more you dig into it, but this is a brief explanation of how it all works.
