What is the complementary color of red?

The complementary color of red is cyan, and red is one of the three primary colors of light. It can be mixed with green and blue to produce any color.

Red is the color at the end of the long wave in the visible spectrum, which excites the observer through energy. The wavelength is about 6 10 to 750 nm, which is similar to the color of fresh blood. Ordinary people can't see the rays with longer wavelength than red, which are generally called infrared rays.

physical features

Red has the lowest frequency in the visible light band of physics, which makes it have many unique properties different from other colors.

The lowest frequency of red means the longest wavelength, and the longest wavelength means the strongest diffraction ability and the strongest obstacle-crossing ability. Therefore, when the red light is used as the warning light, it can be observed effectively even in the bad visual conditions such as foggy days, which is also the fundamental reason why the red light is used as the stop sign.