"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": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
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            "Entry maintenance"
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          "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."
        }
      ],
      "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 entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "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."
        }
      ],
      "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"
}