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focal depth

   Also found in: Dictionary/thesaurus, Legal, Financial, Encyclopedia, Wikipedia 0.01 sec.
depth (depth) distance measured perpendicularly downward from a surface.
focal depth , depth of focus the measure of the power of a lens to yield clear images of objects at different distances.
focal depth
n.
A measure of the power of a lens to produce clear images at different distances from it. Also called depth of focus.
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The quake happened at 1817GMT at a focal depth of 10km, the US Geological Survey reported.
Major earthquake hits Tonga coast by Aljazeera.net
With a 64-micron focal depth, you are able to compensate for any surface fluctuations on the slide," he noted.
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According to the Department, which belongs to the Agriculture Ministry, the earthquakeeIUs epicentre was located in the Prastio Kellakiou region of Limassol with a focal depth of 15 kilometres.
Earthquake tremor in Limassol by Cyprus Mail (Cyprus)
 
 
 
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