What is happening when you see the color red?

When you see the color red, your eyes are detecting light waves with a wavelength of around 625-740 nanometers. These light waves are reflected off of objects and into your eyes, where they are converted into electrical signals that are sent to your brain. Your brain then interprets these signals as the color red.

Red is a primary color, which means it cannot be created by mixing other colors. It is also a warm color, which means it is associated with fire, passion, and anger. In many cultures, red is also a symbol of good luck and prosperity.

Here are some additional facts about the color red:

- Red is the longest wavelength of visible light.

- Red light has the lowest frequency of visible light.

- Red light is absorbed more easily by water than other colors of light.

- Red light is scattered more easily by dust and smoke than other colors of light.

- Red light is used in a variety of applications, including traffic signals, stop signs, and emergency lights.