Question: what is the exact same distance from a parabola
[{'answer': 'focal length', 'provenance': [{'wikipedia_id': '23231', 'title': 'Parabola', 'start_paragraph_id': 3, 'start_character': 407, 'end_paragraph_id': 3, 'end_character': 419, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '23231', 'title': 'Parabola', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 746, 'bleu_score': 0.984188478234951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14788816144446342996}, 'section': 'Section::::Abstract.'}]}]