Teaching UP PGT Mock Test Series 2024 Physics Units, Dimensions and Measurements Measurement of length
One main scale division of a vernier callipers is 'a' cm and nth division of the vernier scale coincide with (n - 1)th division of the main scale. The least count of the callipers in mm is:
1
\(\left( {\frac{{n - 1}}{{10n}}} \right)a\)
2
\(\frac{{10na}}{{\left( {n - 1} \right)}}\)
3
\(\frac{10a}{n}\)
4
\(\frac{{10a}}{{\left( {n - 1} \right)}}\)