Light waves projected on oil surface show seven colours due to the phenomenon of

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Q: 28 (NDA-II/2014)
Light waves projected on oil surface show seven colours due to the phenomenon of
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,21,36,10,23,3,21

keywords: 

{'oil surface show': [0, 0, 0, 1], 'light waves': [0, 0, 1, 1], 'polarization': [0, 0, 1, 6], 'refraction': [0, 0, 1, 0], 'reflection': [1, 1, 2, 19], 'colours': [0, 2, 4, 9], 'interference': [0, 2, 1, 5]}