An article on the U.S. Department of Energy website by the National Nuclear Security Administration titled Visible Light: Eye-opening research at NNSA (17 October 2018) states:
“The entire rainbow of radiation observable to the human eye only makes up a tiny portion of the electromagnetic spectrum – about 0.0035 percent. This range of wavelengths is known as visible light.”
From an article titled What is the visible light spectrum? on the NASA website:
“WAVELENGTHS OF VISIBLE LIGHT: All electromagnetic radiation is light, but we can only see a small portion of this radiation—the portion we call visible light… Typically, the human eye can detect wavelengths from 380 to 700 nanometers.”
From Electromagnetic Spectrum Diagram on the NASA website:
| Gamma Ray | 10-12 |
| X-ray | 10-10 |
| Ultraviolet | 10-8 |
| Visible | 5 x 10-6 |
| Infrared | 10-5 |
| Microwave | 10-1 |
| Radio | 103 |
Articles of Interest 