As shown in $($Figure $1),$ a layer of water covers a slab of material $x$ in a beaker. A ray of light traveling upward follows the path indicated. Assume that ${}_1=47$ and ${}_2=67.$

Figure

$1$ of $1$

Part A

Using the information on the figure, find the index of refraction of material $x.$

Express your answer using three significant figures.

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$n_x=$

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