Reading of vernier scale C1​ can be calculated by the usual method. Reading ​=MSD+LC×VSR=2.8+0.1×7=2.87 cm​In second scale C2​, length of VSD is greater than MSD So, the usual formula will not be applicable. Let the point where scales coincide be P.Total reading =2.8 mm+xFrom figure, x=(8×1)mm−(7×1.1)mm=0.3 mmSo, reading =2.83 mm