"Arago spot" meaning in English

{
  "etymology_text": "Named after Dominique-François-Jean Arago, who performed an experiment demonstrating the spot's existence.",
  "forms": [
    {
      "form": "Arago spots",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Arago spot (plural Arago spots)",
      "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",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optics",
          "orig": "en:Optics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "The Arago spot played an important role in the discovery of the wave nature of light and is a common way to demonstrate that light behaves as a wave.",
          "type": "example"
        }
      ],
      "glosses": [
        "A bright point that appears at the centre of a circular object's shadow due to Fresnel diffraction."
      ],
      "id": "en-Arago_spot-en-noun-wjhl~RnD",
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "bright",
          "bright"
        ],
        [
          "point",
          "point"
        ],
        [
          "circular",
          "circular"
        ],
        [
          "shadow",
          "shadow"
        ],
        [
          "Fresnel diffraction",
          "Fresnel diffraction"
        ]
      ],
      "raw_glosses": [
        "(optics) A bright point that appears at the centre of a circular object's shadow due to Fresnel diffraction."
      ],
      "synonyms": [
        {
          "word": "Fresnel spot"
        },
        {
          "word": "Poisson spot"
        }
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Arago spot"
      ]
    }
  ],
  "word": "Arago spot"
}

{
  "etymology_text": "Named after Dominique-François-Jean Arago, who performed an experiment demonstrating the spot's existence.",
  "forms": [
    {
      "form": "Arago spots",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Arago spot (plural Arago spots)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Optics"
      ],
      "examples": [
        {
          "text": "The Arago spot played an important role in the discovery of the wave nature of light and is a common way to demonstrate that light behaves as a wave.",
          "type": "example"
        }
      ],
      "glosses": [
        "A bright point that appears at the centre of a circular object's shadow due to Fresnel diffraction."
      ],
      "links": [
        [
          "optics",
          "optics"
        ],
        [
          "bright",
          "bright"
        ],
        [
          "point",
          "point"
        ],
        [
          "circular",
          "circular"
        ],
        [
          "shadow",
          "shadow"
        ],
        [
          "Fresnel diffraction",
          "Fresnel diffraction"
        ]
      ],
      "raw_glosses": [
        "(optics) A bright point that appears at the centre of a circular object's shadow due to Fresnel diffraction."
      ],
      "synonyms": [
        {
          "word": "Fresnel spot"
        },
        {
          "word": "Poisson spot"
        }
      ],
      "topics": [
        "engineering",
        "natural-sciences",
        "optics",
        "physical-sciences",
        "physics"
      ],
      "wikipedia": [
        "Arago spot"
      ]
    }
  ],
  "word": "Arago spot"
}