Final answer:
The color of light produced when mixing the primary colors of red, green, and blue light in equal proportions is white light, due to additive color mixing. This principle is what allows devices like RGB televisions and computer displays to create a wide spectrum of colors with just three colors of light.
Step-by-step explanation:
When the three primary colors of light, which are red, green, and blue, are mixed together in equal proportions, the resulting color of light produced is white light. This happens due to what is known as additive color mixing. Unlike subtractive color mixing which happens with pigments, additive mixing occurs when you combine the light of these three primary colors. Since different wavelengths of light are perceived as different colors by the human eye, red, green, and blue light each contribute a range of wavelengths that together make up the white light we see - which corresponds to a mixture of all the colors as seen in sunlight.
In additive color mixing, the perception of white light is a result of the amalgamation of these colors in the correct proportions. If red, green, and blue lights are projected onto a single spot, the overlap of these three colors of light will give the appearance of white. This principle is what allows devices such as RGB color televisions and computer displays to reproduce a full spectrum of colors through a combination of only three colors. Each pixel on an RGB screen consists of subpixels that emit red, green, or blue light; turning these on in different combinations can create the vast range of colors that the human eye can perceive on the screen.