Determine the position of the bubble from the nearest face, Physics

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A transparent glass cube, of side 20 cm has a small air bubble. When it is viewed normally from the nearest face it seems to be at 0.05 cm from that face and when it viewed through the opposite face, the air bubble seems to be 7.5 cm from that face. Determine the position of the bubble from the nearest face and also the refractive index of glass.


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