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What is relative refractive index?...

What is relative refractive index?

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In the equation for Snell's law, `(sin i)/(sin r) = (n_1)/(n_2)` the term `(n_2/n_1)` is called relative refractive index of second medium with respect to the first medium which is denoted as `(n_(21))`
`n_2 = n_2/n_1`
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