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The refractive index of diamond is `2.42`. What is the meaning of this statement ?

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The refractive index of diamond is `2.42`. What is the meaning of this statement ?
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As refractive index `= ("speed of light in vacuum")/("speed of light in diamond")`,
`2.42 = (3 xx 10^(8) m//s)/v " " v = (3 xx 10^(8))/(2.42) m//s = 1.24 xx 10^(8) m//s`.
This is the speed of light in diamond.
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