An ice cube has a bubble inside. When viewed from one side the apparent distance of the bubble is 12 cm. When viewed from the opposite side, the apparent distance of the bubble is observed as 4 cm. If the side of the ice cube is 24 cm, the refractive index of the ice cube is
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Let's assume that the original position of the bubble is x from one side of the ice cube of side a. When the bubble is seen from one side, it can be written that
…
For the view from the other side, it can be written that
...
From equations and , it is given that
24-12 
= 4 
= 1.5
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