An observer can see through a small hole on the side of a jar (radius 
) at a point at height of 
from the bottom (see figure). The hole is at a height of 
. When the jar is filled with a liquid up to a height of 
the same observer can see the edge at the bottom of the jar. If the refractive
index of the liquid is 
where 
is an integer, the value of 
is
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