Question

Vernier callipers has 20 divisions on its vernier scale which coincide with 19 divisions on the main scale.Least count of the instrument is 0.1 mm.The main scale division is

Answer 1

20 vsd =19 msd
1 vsd =19/20 msd
LC = 1msd - 1 vsd
0.1= 1msd - 19/20 msd
0.1= 1/20 msd
0.1 × 20 = msd
2 = msd