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# A person looking into an empty container is able to see the far edge of the container's bottom as shown in this Figure. The height of the container is $$h,$$ and its width is $$d$$. When the container is completely filled with a fluid of index of refraction $$n$$ and viewed from the same angle, the person can see the center of a coin at the middle of the container's bottom as shown in this Figure.For what range of values of $$n$$ will the center of the coin not be visible for any values of $$h$$ and $$d$$?

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#### For $$n=1, h=0 .$$ For $$n=2, h=\infty .$$ For $$n>2, h$$ has no real solution.

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