The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is

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Q: 31 (CDS-I/2017)
The optical phenomenon that is primarily responsible for the observation of rainbow on a rainy day is
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,81,77,28,17,95,18

keywords: 

{'optical phenomenon': [0, 0, 0, 1], 'rainbow': [0, 0, 0, 3], 'diffraction': [0, 2, 2, 9], 'dispersion': [0, 0, 1, 16], 'reflection': [1, 1, 2, 19], 'rainy day': [0, 0, 0, 1], 'interference': [0, 2, 1, 5], 'observation': [0, 0, 0, 5]}