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What is the difference between focus and principal focus

Question asked by: vinay

Asked on: 28 Sep 2008

Here is the definition of principal focus:
That point where the light rays coming from a distant object converge after passing through a lens, coming to a focus and forming an image

Therefore principal focus is a specific term with a specific definition; focus is just a generic term for accurately rendering light rays.

By: knowitall
Replied at: 05 Oct 2008
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focus  principal  difference  

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