Basic Maths and Units and DimensionsHard

Question

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 :-
    

Options

A.5/2
B.
C.
D.3/2

Solution

  
The line of sight of the observer remains constant, making an angle of 45° with the normal.
sinθ =
μ =

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