Question

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Answer 1

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Answer 2

$Refractive \: index \: of \: N = \frac{3 \times {10}^{8} }{0.6 \times {10}^{8} }$

$= \frac{3 \times 10}{6} = \frac{10}{2} = 5$

so, Refractive index of N is 5

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