Multiple Choice Question XVII — task. Science CBSE, Class 10.

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R.I. of glass w.r.t. air is

$\frac{3}{2}$ , then the R.I. of air w.r.t. glass is –

$3$
$\frac{3}{4}$
$\frac{2}{3}$
$\frac{1}{3}$

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