Q15. In finding out refractive index of glass slab the following observations were made through travelling microscope 50 vernier scale division $= 49 \mathrm { MSD }$; 20 divisions on main scale in each cm For mark on paper $\mathrm { MSR } = 8.45 \mathrm {~cm} , \mathrm { VC } = 26$ For mark on paper seen through slab MSR $= 7.12 \mathrm {~cm} , V C = 41$ For powder particle on the top surface of the glass slab $\mathrm { MSR } = 4.05 \mathrm {~cm} , \mathrm { VC } = 1$ (MSR = Main Scale Reading, $\mathrm { VC } =$ Vernier Coincidence) Refractive index of the glass slab is : (1) 1.52 (2) 1.35 (3) 1.42 (4) 1.24
Q15. In finding out refractive index of glass slab the following observations were made through travelling microscope 50 vernier scale division $= 49 \mathrm { MSD }$; 20 divisions on main scale in each cm For mark on paper\\
$\mathrm { MSR } = 8.45 \mathrm {~cm} , \mathrm { VC } = 26$ For mark on paper seen through slab MSR $= 7.12 \mathrm {~cm} , V C = 41$ For powder particle on the top surface of the glass slab $\mathrm { MSR } = 4.05 \mathrm {~cm} , \mathrm { VC } = 1$ (MSR = Main Scale Reading, $\mathrm { VC } =$ Vernier Coincidence) Refractive index of the glass slab is :\\
(1) 1.52\\
(2) 1.35\\
(3) 1.42\\
(4) 1.24