Ultraviolet radiation is not visible to the human eye. Its wavelength is shorter than that of visible light. Ultraviolet radiation is divided into the following ranges:
| Near UV (UV-A) | 380 - 315 nm |
| Middle UV (UV-B) | 315 - 280 nm |
| FAR UV (UV-C) | 280 - 200 nm |
| Vacuum UV (UV-C) | 200 - 100 nm |
The visible area is the range of electromagnetic radiation that is visible to the human eye. It covers the wavelength spectrum between 380 nm and 780 nm. Light features different wavelengths. A prism or optical grating permits “multicolor” light to be split into monocolor light components known as spectral colors.
| Violet | 380 - 420 nm |
| Blue | 420 - 490 nm |
| Green | 490 - 575 nm |
| Yellow | 575 - 585 nm |
| Orange | 585 - 650 nm |
| Red | 650 - 780 nm |
Near infrared radiation (NIR) is not visible to the human eye. Its wavelength is longer than that of visible light. NIR features a shorter wavelength range than infrared radiation. Infrared radiation is divided into the following ranges:
| Near Infrared (IR-A) | 780 - 1400 nm |
| Near Infrared (IR-B) | 1400 - 3000 nm |
| Middle Infrared (MIR-IR) | 3000 - 50000 nm |
| FAR Infrared (FIR) | 50000 - 1000000 nm |
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