An observer can see through a small hole on the side of the jar ( radius 15\; cm) at a point of height of 45\; cm. When the jar is filled with a liquid up to a height of 30\; cm the same observer can see the edge at the bottom of the jar. If the R.I. of the liquid is \frac{N}{100}, where N  is an integer the value of N is 
Option: 1 5
Option: 2 46
Option: 3 158
Option: 4 96

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