Interest
Proportion of Hacker News items mentioning "light" over time.
Mentions
Total number of Hacker News items mentioning "light" over time.
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz. The visible band sits adjacent to the infrared and the ultraviolet, called collectively optical radiation. Read more on Wikipedia