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A vertical microscope is focussed on a p...

A vertical microscope is focussed on a point at the bottom of an empty tank. Water (`mu = 4//3`) is then poured into the tank. The height of the water column is 4cm. Another lighter liquid, which does not mix with water and which has refractive index 3/2 is then poured over the water.The height of liquid column is 2cm. What is the vertical distance through which the microscope must be moved to bring the object in focus again ?

A

2.61 m

B

1.55 m

C

3.12 m

D

1.67 m

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