Light (nonfiction)

Light, 1943.

Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.

The word usually refers to visible light, which is visible to the human eye and is responsible for the sense of sight.

Visible light is usually defined as having wavelengths in the range of 400–700 nanometres (nm), or 4.00 × 10−7 to 7.00 × 10−7 m, between the infrared (with longer wavelengths) and the ultraviolet (with shorter wavelengths).

This wavelength means a frequency range of roughly 430–750 terahertz (THz).

In the News

• 
• Color wheel from 1809 and light from 1943: can their long-distance love survive?
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  Light from 1943 excited to meet Pink Floyd backstage after the Laser concert.

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  Off-duty Green Lanterns tour with Pink Floyd, help out with Laser concerts.

Fiction cross-reference

• Gray light

Nonfiction cross-reference

• Color (nonfiction)
• Green Lantern (nonfiction)

External links:

• Light