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What is the Wavelength of Red?

Published in Optics 1 min read

The wavelength of red light typically ranges from approximately 625 to 740 nanometers (nm).

This means that red light has one of the longest wavelengths in the visible spectrum, placing it at the opposite end from violet. The color we perceive as "red" is determined by the specific wavelengths of light that are reaching our eyes. Different shades of red will correspond to slightly different wavelengths within this range.

Here's a breakdown:

  • Visible Spectrum: The visible spectrum is the portion of the electromagnetic spectrum that is visible to the human eye. It ranges from approximately 380 nm (violet) to 750 nm (red).

  • Red's Position: Red occupies the long-wavelength end of the visible spectrum, bordering infrared light (which has even longer wavelengths and is not visible to humans).

  • Different Shades: The specific shade of red depends on the precise wavelength. For example, a "deep red" might be closer to 740 nm, while a "brighter red" may be closer to 625 nm.