The production of various colors of light by the mixing of the three primary colors of light is called color addition.
The color addition principles discussed on this page can be used to make predictions of the colors that would result when different colored lights are mixed.
Television and computer make different colours using colour addition of primary colours of light.
As we can see in the image, Red and blue colour gives magenta colour.
Red and green give a yellow colour.
The real time example of color addition can be seen in theatre stage illumination where several coloured light projectors illuminate the same region.
