Question: the amount of light reflected from the front surface of common window glass is about
[{'answer': 'about 4 % per surface', 'provenance': [{'wikipedia_id': '584887', 'title': 'Optical coating', 'start_paragraph_id': 12, 'start_character': 64, 'end_paragraph_id': 12, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Types of coating.:Antireflection coatings.\n'}]}, {'provenance': [{'wikipedia_id': '584887', 'title': 'Optical coating', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 325, 'bleu_score': 0.9632870032952191, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9014659680876705795}, 'section': 'Section::::Types of coating.:Antireflection coatings.\n'}]}]