A transparent cube of \( 15 \mathrm{~cm} \) edge contains a small a...

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A transparent cube of \( 15 \mathrm{~cm} \) edge contains a small air
\( \mathrm{P} \) bubble. Its apparent depth when viewed through one face is \( 6 \mathrm{~cm} \) and when viewed through opposite face is
W \( 4 \mathrm{~cm} \). The refractive index of material of cube is
(a) 2.0
(b) 1.5
(c) 1.6
(d) 2.5
(AllMS)
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