One main scale division of a vernier callipers is a cm and n th division of the vernier scale coincide with n - 1 th division of the main scale. The least count of the callipers in mm is :

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n - 1 a = n a ' a ' = n - 1 a n ∴ L . C . = 1 MSD - 1 VSD = a - a ' cm = a - n - 1 a n = n a - n a + a n = a n cm = 10 a n mm

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