Question
$_2n_1$ : Refractive index of medium $2$ with respect to medium $1 : : _1n_2 $: _______

Answer

$_2n_1 :$ Refractive index of medium $2$ with respect to medium $1 : : _1n_2 :$ 
Refractive index of medium 1 with respect to medium 2.

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