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With respect to air, the refractive index of ice is `1*31` and that of rock salt is `1*54`. Calcualte the refractive index of rock salt w.r.t ice.

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Here, `.^(a)n_(i)=1.31` and `.^(a)n_(r) =1.54 , .^(i)n_(r)=?` Now, `.^(i)n_(r) =(.^(a)n_(r))/(.^(a)n_(i))=(1.54)/(1.31)=1.17`.

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