One main scale division of a Vernier caliper is ‘a’ cm and $n^{th}$ division of the Vernier scale coincides with $(n-1)^{th}$ division of the main scale. The least count of the caliper in mm is:

(A) $ \frac {10na}{(n-1)} $
(B) $ \frac {10a}{(n-1)}$
(C) $ \frac {10a}{n} $
(D) $ (\frac {n-1}{10n})a$ Continue reading One main scale division of a Vernier caliper is ‘a’ cm …. →