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N divisions on the main scale of a verni...

`N` divisions on the main scale of a vernier callipers coincide with `N + 1` divisions on the vernier scale. If each division on the main scale is of a units, determine the least count of the instrument.

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(n+1) division of Vernier scale =n division of scale
`:.` one Vernier division `=(n)/(n+1)`main scale division.
Least count =1M.S.D.-1V.D=(1)/(n+1)M.S.D=(a)/(n+1)1
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