A layer of oil \( 3 \mathrm{~cm} \) thick is floating on a layer of...

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A layer of oil \( 3 \mathrm{~cm} \) thick is floating on a layer of coloured water \( 5 \mathrm{~cm} \) thick. Refractive index of coloured water is \( 5 / 3 \) and the apparent depth of the two liquids appears to
\( \mathrm{P} \) be \( 36 / 7 \mathrm{~cm} \). Find the refractive index of oil.
(A) \( 1.6 \)
(B) \( 1.4 \)
W
(C) \( 1.9 \)
(D) \( 0.9 \)
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