What is the resulting color when red and blue lights are mixed together?

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When red and blue lights are mixed together, the resulting color is purple. This phenomenon occurs due to the additive color mixing process, which is how light colors combine. In additive color mixing, different colors of light can be combined to create new colors.

Red light, which has a longer wavelength, and blue light, with a shorter wavelength, combine to create purple. This is because when both red and blue light are present, they stimulate our color receptors (cones) in such a way that our brain interprets the combined light as purple.

This concept is fundamental in various applications, such as digital screens and stage lighting, where primary colors of light (red, green, and blue) can be mixed in different proportions to produce a wide spectrum of colors. Thus, the correct answer illustrates the principle of additive color mixing effectively.