In finding out refractive index of glass slab the following observations were made through travelling microscope 50 vern…

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
\(
MSR =8.45 cm , VC =26
\)

For mark on paper seen through slab
\(
MSR =7.12 cm , VC =41
\)

For powder particle on the top surface of the glass slab
\(
\text { MSR }=4.05 cm , VC =1
\)
(MSR \(=\) Main Scale Reading, \(VC =\) Vernier Coincidence \()\)
Refractive index of the glass slab is :

[JEE Main 2024, 06 Apr (Shift 2)]