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

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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 , V C = 41 For powder particle on the top surface of the glass slab MSR = 4.05 cm , VC = 1 (MSR = Main Scale Reading, VC = Vernier Coincidence) Refractive index of the glass slab is :

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​ 1 MSD = 20 1 cm ​ = 0.05 cm 1 VSD = 50 49 ​ MSD = 50 49 ​ × 0.05 cm = 0.049 cm LC = 1 MSD − 1 VSD = 0.001 cm ​ For mark on paper, L 1 ​ = 8.45 cm + 26 × 0.001 cm = 84.76 mm For mark on paper through slab, L 2 = 7.12 cm + 41 × 0.001 cm = 71.61 mm For powder particle on top surface, ZE = 4.05 cm + 1 × 0.001 cm = 40.51 mm ∴ ⇒ ​ actual L 1 ​ = 84.76 − 40.51 = 44.25 mm actual L 2 ​ = 71.61 − 40.51 = 31.10 mm L 2 ​ = μ L 1 ​ ​ μ = L 2 ​ L 1 ​ ​ = 31.10 44.25 ​ = 1.42 ​

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