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A transparent cube of 15 cm edge contain...

A transparent cube of `15 cm` edge contains a small air bubble. Its apparent depth when viewed through one face is `6 cm` and when viewed through the opposite face is `4 cm`. Then the refractive index of the material of the cube is

A

`2.0`

B

`1.5`

C

`1.6`

D

`2.5`

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The correct Answer is:
B
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