"field lens" meaning in English

{
  "forms": [
    {
      "form": "field lenses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "field lens (plural field lenses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optics",
          "orig": "en:Optics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "a positive-powered lens or group of lenses that comes after the objective lens and before the image plane or the eyepiece, serving to change the size of the image"
      ],
      "id": "en-field_lens-en-noun-Wz8w5qz9",
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "objective lens",
          "objective lens"
        ],
        [
          "image plane",
          "image plane"
        ],
        [
          "eyepiece",
          "eyepiece"
        ]
      ],
      "raw_glosses": [
        "(optics) a positive-powered lens or group of lenses that comes after the objective lens and before the image plane or the eyepiece, serving to change the size of the image"
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "field lens"
      ]
    }
  ],
  "word": "field lens"
}

{
  "forms": [
    {
      "form": "field lenses",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "field lens (plural field lenses)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "en:Optics"
      ],
      "glosses": [
        "a positive-powered lens or group of lenses that comes after the objective lens and before the image plane or the eyepiece, serving to change the size of the image"
      ],
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "objective lens",
          "objective lens"
        ],
        [
          "image plane",
          "image plane"
        ],
        [
          "eyepiece",
          "eyepiece"
        ]
      ],
      "raw_glosses": [
        "(optics) a positive-powered lens or group of lenses that comes after the objective lens and before the image plane or the eyepiece, serving to change the size of the image"
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "field lens"
      ]
    }
  ],
  "word": "field lens"
}