Since 10 VSD=9 MSD∴1 VSD=109​ MSD Least count (L.C.)=1 MSD−1 VSD=(1−109​) MSD=0.1 MSD=0.1×0.1 cm=0.01 cm Since 0 of Vernier scale lie before 0 of main scale. Zero error =−[10−6] L.C. =−4×0.01 cm=−0.04 cm∴ Correct diameter of the sphere = Reading − Zero error =3.1+1× L.C. −(−0.04)
