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ICSE Class 10 Physics 2017 Paper

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How is refractive index of a material related to:
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Question : 10 of 65
Marks: +1, -0
Velocity of light in vacuum or air and the velocity of light in a given medium?
Solution:  
aμm= Speed of light in vaccum or air (c)  Speed of light in that medium (v){}_{a}\mu_m = \frac{\text{ Speed of light in vaccum or air (c) }}{\text{ Speed of light in that medium } (v)}
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