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One main scale division of a Vernier calipers 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 calipers in mm is:

a
10nan−1
b
n−110na
c
10an−1
d
10an

detailed solution

Correct option is D

Given : 1MSD= a cm nVSD=(n-1)MSD ⇒1VSD=n-1nMSD=n-1na  LC =1MSD-1VSD=a-n-1na=ancm =10anmm

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