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A transparent cube of $15 \mathrm{~cm}$ edge contains a small air bubble. Its apparent depth when viewed through one face is $6 \mathrm{~cm}$ and when viewed through opposite face is $4 \mathrm{~cm}$. The refractive index of material of cube is
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The correct answer is:
$1.5$
Here, real depth, $x=15 \mathrm{~cm}$ apparent depth, $y=6+4=10 \mathrm{~cm}$
$\mu=\frac{x}{y}=\frac{15}{10}=1.5$
$\mu=\frac{x}{y}=\frac{15}{10}=1.5$
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