Answer:
A vernier works on the principle that
n V = (n - 1) S
n is the number of divisions on the main scale
S is the length of the smallest main scale division
V is the length of a division on the vernier scale
We can rewrite our above equation as
Least count = S - V = S / n
For a simple caliper the main scale would be graduated in mm
There would be 10 vernier divisions for each 9 main scale divisions
The least count would be 0.1 mm
