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extended source

   Also found in: Encyclopedia 0.01 sec.
source, extended 
A source consisting of many point sources separated laterally and such that it has a very low degree of coherence. Thus, an extended source has a given size and subtends a given angle. See coherent sources; beam of light; diffuse light.


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The reference lamp, which was used to obtain the spectral response correction is an extended source, while the orange glass spectrum was taken for a line source (the laser beam is focused inside the cuvette).
X-rays were also produced by supernova remnants, and these appeared as more extended sources than young stars.
At a stage, the mind gets accustomed to the release of these chemicals & it searches out for extended sources of high.
 
 
 
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