Encyclopedia > Optical window

  Article Content

Optical window

In astronomy, the term optical window refers to a portion of the electromagnetic spectrum that passes through the atmosphere all the way to the ground. Most EM energy never makes it through the atmosphere, so this is like a window that lets in just a little of what's out there. It is called "optical" because the wavelengths we can see are all in this range. The window runs from around 300 nanometers (ultraviolet-C) at the short end up into the range the eye can use, roughly 400-700 nm and continues up through the visual infrared to around 1100 nm, which is thermal infrared.

There is another window called the "radio window" that lets through some (not all) radio waves. The radio window runs from about one centimeter to about eleven meter waves.



All Wikipedia text is available under the terms of the GNU Free Documentation License

 
  Search Encyclopedia

Search over one million articles, find something about almost anything!
 
 
  
  Featured Article
Reformed churches

... been resolved. From the continuing branch churches, some have split in turn. Only some of the continuing branches from the main bodies are listed here, with the year of ...

 
 
 
This page was created in 44.6 ms