Between the infrared (IR) and ultraviolet (UV) portions of the electromagnetic spectrum lies visible light. Its frequencies range from 4 × 1014  to 8 × 1014 hertz (Hz), or cycles per second, and its wavelengths range from 740 nanometers (nm) or 2.9 × 10−5 inches, to 380 nm (1.5 × 10−5 inches).