Subject :NSO Class : Class 10
An observer can see through a pinhole, the top end of a thin rod of height h, placed as shown in the figure.The beaker height is 3h and its radius is 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
A5⁄2
B√5⁄2
C√3⁄2
D3⁄2