1 terahertz (THz) = 103 GHz = 106 MHz = 1012 Hz,
1 nm = 10-3 um = 10-6 mm = 10-9 m.
The white light is a mixture of the colors of the visible spectra.
|Color Wavelength (nm)||Frequency (THz)|
|Red||780 - 622||384 - 482|
|Orange||622 - 597||482 - 503|
|Yellow||597 - 577||503 - 520|
|Green||577 - 492||520 - 610|
|Blue||492 - 455||610 - 659|
|Violet||455 - 390||659 - 769|
Wavelengths are a common way of describing light waves.
Wavelength = Speed of light in vacuum / Frequency.
The speed of light is the velocity of electromagnetic wave in vacuum, which
is 300,000 km/sec.
Light travels slower in other media(substances such as water or air), and different wavelengths travel at different speeds in the same media. When light passes from one media to another, it changes speed, which causes a deflection of light called refraction. The index of refraction, n, is defined as the following ratio:
n = Speed of light in vacuum / Speed of light in a specific medium.
Here are four of the most important and interesting light colors. They are:
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