ICSE Class 10 Physics 2017 Solved Paper

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How is refractive index of a material related to:
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Question : 10
Total: 65
Velocity of light in vacuum or air and the velocity of light in a given medium?
Solution:  
โ€Œaยตm=โ€Œ
โ€Œ Speed of light in vaccum or air (c) โ€Œ
โ€Œ Speed of light in that medium โ€Œ(v)
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