"Cassegrain reflector" meaning in English

{
  "etymology_text": "Named after Laurent Cassegrain, its probable inventor.",
  "forms": [
    {
      "form": "Cassegrain reflectors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "Cassegrain reflector (plural Cassegrain reflectors)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "glosses": [
        "A combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture."
      ],
      "id": "en-Cassegrain_reflector-en-noun-MXHbvuON",
      "wikipedia": [
        "Cassegrain reflector",
        "Laurent Cassegrain"
      ]
    }
  ],
  "word": "Cassegrain reflector"
}

{
  "etymology_text": "Named after Laurent Cassegrain, its probable inventor.",
  "forms": [
    {
      "form": "Cassegrain reflectors",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Cassegrain reflector (plural Cassegrain reflectors)",
      "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"
      ],
      "glosses": [
        "A combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture."
      ],
      "wikipedia": [
        "Cassegrain reflector",
        "Laurent Cassegrain"
      ]
    }
  ],
  "word": "Cassegrain reflector"
}