Visible spectrum
Visible Spectrum
The Visible Spectrum (pronounced: /ˈvɪzɪbəl ˈspɛktrəm/) is the portion of the electromagnetic spectrum that is visible to the human eye. Electromagnetic radiation in this range of wavelengths is called visible light or simply light. A typical human eye will respond to wavelengths from about 380 to 750 nanometers.
Etymology
The term "Visible Spectrum" is derived from the Latin word "visibilis" meaning "able to be seen" and the Greek word "σπεκτρον" (spectron) meaning "appearance" or "apparition".
Related Terms
- Electromagnetic Spectrum: The range of all types of EM radiation. Radiation is energy that travels and spreads out as it goes – the visible light that comes from a lamp in your house and the radio waves that come from a radio station are two types of electromagnetic radiation.
- Wavelength: The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
- Nanometer: A unit of spatial measurement that is 10^-9 meter, or one billionth of a meter. It is commonly used in nanotechnology, the building of extremely small machines.
- Visible Light: Visible light is the range of electromagnetic waves that we can detect with our eyes. It ranges from about 400 to 700 nanometers.
See Also
External links
- Medical encyclopedia article on Visible spectrum
- Wikipedia's article - Visible spectrum
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