In finding out refractive index of glass slab the following observations were made through travelling microscope 50 vernier scale division 
49 MSD; 20 divisions on main scale in each 
For mark on paper
For mark on paper seen through slab
For powder particle on the top surface of the glass slab
Main Scale Reading, VC 
Vernier Coincidence)
Refractive index of the glass slab is:
Text Solution
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For mark on paper, 
For mark on paper through slab, L2 
For powder particle on top surface, 
actual 
actual 
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