A tank contains three layers of immiscible liquids as shown in figure. The first layer is of wate...

A tank contains three layers of immiscible liquids as shown in figure. The first layer is of water with refractive index 4 / 3 and thickness 8  cm. The second layer is an oil with refractive index 3 / 2 and thickness 9  cm while the third layer is of glycerine with refractive index 2 and thickness 4  cm. The apparent depth (in cm ) of the bottom of the container is

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