How Light affects us

and how it affects the world

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Last Updated: Thursday, January 26, 2006 3:20 PM

 


 

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:

  1. Plants
  2. World
  3. Mind
  4. Sight

 

Click here to go to a interactive site.

Click here to hear a little about my site.

Click here to go see a movie introduction to my site.

 

 

Main
Plants
World
Mind
Sight

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