Refractive Index Glass Slab

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 cm For mark on paper
MSR=8.45‌cm,VC=26
For mark on paper seen through slab
MSR=7.12‌cm,VC=41
For powder particle on the top surface of the glass slab
MSR=4.05‌cm,VC=1
(MSR = Main Scale Reading, VC= Vernier Coincidence)
Refractive index of the glass slab is:

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