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Definition of Focal depth
1. Noun. (geology) The depth below the Earth's surface of the hypocentre of an earthquake. ¹
2. Noun. (optics) The field of view of a camera that is in sharp focus. ¹
¹ Source: wiktionary.com
Medical Definition of Focal depth
1. Depth of focus, the greatest distance through which an object point can be moved while maintaining a clear image. Synonym: penetration. (05 Mar 2000)