question_subject:
Science
question_exam:
CAPF
stats:
0,130,22,11,9,130,2
keywords:
{'optical fibre': [0, 1, 0, 3], 'optical phenomenon': [0, 0, 0, 1], 'light signal': [0, 0, 0, 1], 'total internal reflection': [0, 1, 2, 1], 'refraction': [0, 0, 1, 0], 'propagation': [2, 0, 0, 5], 'interference': [0, 2, 1, 5]}