If division of main scale coincides with divisions of vernier scale

PHYSICS · Subjective · ICSE · Physics · Measurements and Experimentation · Measurements and Experimentation

Problem

n^{\text{th}}

division of main scale coincides with

(n+1)^{\text{th}}

divisions of vernier scale. Given one main scale division is equal to '

a

' units. Find the least count of the vernier.