Why are laser goggles are colored the way they are?

Looking at the color wheel, you can see what colors are opposites of each other - IE, green is the opposite of red, and orange is the opposite of blue. If your laser is green, the opposite color (Red) will absorb more of the laser's light than any other color. Since the object is to reduce the amount of light reaching your eyes, the laser's light needs to be absorbed by the goggles. So, protective goggles for green lasers are red, goggles for blue lasers are usually orange (Because the wavelengths for green and blue are so similar, many goggles are simply orange - these serve very well at protecting from both wavelengths) and goggles for red lasers are either blue or dark green.