Science Fair Project Encyclopedia
Blocker
A blocker is the inverse of a filter, instead of blocking everything like the filter does, it lets everything else pass and blocks only the specified things.
For instance, an infrared blocker blocks out infrared light, and lets visible light (among other wave lengths) pass through. An infrared filter blocks the visible light and lets only the infrared pass.
10-26-2009 08:16:03
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The contents of this article is licensed from www.wikipedia.org under the GNU Free Documentation License. Click here to see the transparent copy and copyright details