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An observer can see through a pin-hole t...

An observer can see through a pin-hole the top end of a thin rod of height h, placed as shown in the figure. The beaker height is 3h and its radius h. When the beaker is filled with a liquid up to a height 2h, he can see the lower end of the rod. Then the refractive index of the liquid is

A

`5//2`

B

`sqrt(5//2)`

C

`sqrt(3//2)`

D

`3//2`

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