Describe an experiment to determine the refractive index of a liquid using travelling microscope

Describe an experiment to determine the refractive index of a liquid using travelling microscope.

A vertically traveling microscope having a graduated scale T besides it is focused on sand particles placed at O on bottom of the container. The scale reading a on T

is noted.

A liquid whose refractive index is required is filled in a container and the microscope is raised until the particles are refocused at I. The scale reading b is again noted.

Finally the traveling microscope is focused on the liquid surface giving a scale reading c.

Thus n_L =  (c-a)/(c-b)

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