A transparent cube of side 210 mm contai...

A transparent cube of side 210 mm contains a small air bubble. Its apparent distance, when viewed through one face of the cube is 100 mm and when viewed through the opposite face is 40 mm. What is the actual distance of the bubble from the second face and what is the refractive index of the material of the cube?

0.04 m

0.05 m

0.06 m

0.17 m

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