"focal depth" meaning in English

{
  "forms": [
    {
      "form": "focal depths",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "focal depth (plural focal depths)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
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            "Fundamental"
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      ],
      "glosses": [
        "The depth below the Earth's surface of the hypocentre of an earthquake."
      ],
      "id": "en-focal_depth-en-noun-3YLLDPiR",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "hypocentre",
          "hypocentre"
        ],
        [
          "earthquake",
          "earthquake"
        ]
      ],
      "raw_glosses": [
        "(geology) The depth below the Earth's surface of the hypocentre of an earthquake."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    },
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optics",
          "orig": "en:Optics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The field of view of a camera that is in sharp focus."
      ],
      "id": "en-focal_depth-en-noun-giUjbPa-",
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "field of view",
          "field of view"
        ]
      ],
      "raw_glosses": [
        "(optics) The field of view of a camera that is in sharp focus."
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "focal depth"
}

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  "forms": [
    {
      "form": "focal depths",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "focal depth (plural focal depths)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "en:Geology"
      ],
      "glosses": [
        "The depth below the Earth's surface of the hypocentre of an earthquake."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "hypocentre",
          "hypocentre"
        ],
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          "earthquake",
          "earthquake"
        ]
      ],
      "raw_glosses": [
        "(geology) The depth below the Earth's surface of the hypocentre of an earthquake."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    },
    {
      "categories": [
        "en:Optics"
      ],
      "glosses": [
        "The field of view of a camera that is in sharp focus."
      ],
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          "optics",
          "optics"
        ],
        [
          "field of view",
          "field of view"
        ]
      ],
      "raw_glosses": [
        "(optics) The field of view of a camera that is in sharp focus."
      ],
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        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ]
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  "word": "focal depth"
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