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JEE Main202116 Mar 2021Morning ShiftPhysicsExperimental PhysicsActual

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 :

Options

  1. A10 n a n - 1
  2. B10 a n - 1
  3. Cn - 1 10 n
  4. D10 a n

Correct answer

D. 10 a n

Step-by-step solution

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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