Which one of the following statements about the refractive index of a material medium with respect to air is correct ? -

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Q: 53 (NDA-I/2018)

Which one of the following statements about the refractive index of a material medium with respect to air is correct ? -
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,8,10,5,4,1,8

keywords: 

{'refractive index': [0, 1, 1, 5], 'material medium': [0, 0, 0, 1], 'air': [1, 0, 0, 0], 'materials': [0, 1, 1, 0], 'unity': [1, 0, 0, 5]}