Which color of visible light has the longest wavelength?

The color of visible light with the longest wavelength is red. This is important to understand because the visible spectrum ranges from approximately 380 nanometers (violet) to about 750 nanometers (red). As you move through the spectrum from violet to red, the wavelengths increase in length.

Red light, which has a wavelength of around 620 to 750 nanometers, falls at the far end of this spectrum, making it the color with the longest wavelength. The other colors, such as green, blue, and violet, have shorter wavelengths, which is why red is distinctly recognized for its longer wavelength compared to these other colors. Understanding the arrangement of colors in the visible light spectrum is crucial in many fields, including optics, photography, and even in understanding natural phenomena like rainbows.