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 3 h and its radius h . When the beaker is filled with a liquid up to a height 2 h , he can see the lower end of the rod. Then the refractive index of the liquid is
A
5/2
B
C
D
3/2
Text Solution
Verified by ExpertsThe correct answer is:
B
The line of sight of the observer remains constant, making an angle of 45° with the normal.
= 
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