What Is the Wavelength of Red Light?

By Staff WriterLast Updated Mar 25, 2020 1:44:20 AM ET

In the visible light spectrum, the wavelength of red light ranges from 622 to 780 nanometers. Red light has the longest wavelength and the shortest frequency. Violet light, which has the shortest wavelength, is at the other end of the visible spectrum.

The wavelengths of the visible spectrum range from 780 nanometers (red light) to 390 nanometers (violet light). The visible light spectrum is part of the electromagnetic spectrum. The electromagnetic spectrum consists of an entire range of wavelengths that include those that are either lower or higher than the visible light wavelengths.

Infrared, microwave and radio waves have higher wavelengths than red light. Ultraviolet rays, X-rays and gamma rays have lower wavelengths than violet light. Electromagnetic waves can also travel through space or a vacuum.