A layer of oil 3 cm thick is flowing on ...

A layer of oil 3 cm thick is flowing on a layer of coloured wtater 5 cm thick. Refractive index of coloured water is `(5)/(3)` and the apparent depth of the two liquids appears to be `(36)/(7)` cm . What is the refractive index of oil?

1.4

2.4

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