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

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Real depth / apparent depth = refractive index    h1 / 6 cm = μ    =>  h1 = 6 μ  cm    h2 / 4cm =  μ    =>  h2 = 4 μ  cm         h1 + h2 =  15 cm = 10 μ    =>    μ = 1.5 cm The bubble is in the middle of the width of the cube.  So real depth from h1 one side face is equal to (15-h1) of the real depth from the opposite face.

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