At Last I See the Light

We have been talking about light in Physics lately, and light, like pretty much everything else, is made up of waves. Light is just electromagnetic waves, which are produced by a vibrating charge. There are a lot of different kind of electromagnetic waves, and we classify them based on their frequencies. This list of waves based on frequencies is called the electromagnetic spectrum, shown below

As you can see, we can only see a tiny fraction of electromagnetic waves, called the visible spectrum. 

I think it would be cool if we could see all the waves though, Jah feel Blake?

The visible light spectrum has some rules. Black absorbs light, white reflects it. Black is the absence of light. The primary colors of light are red, blue, and green. When red and blue mix, we get magenta. When red and green are mixed, we get yellow. When blue and green are mixed, we get cyan. When all three are mixed we get white. 

The picture above shows some colored laser shining on a white board. We did this so we could see how colors mixed.