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JEE Main202229 Jul 2022Morning ShiftPhysicsExperimental PhysicsActual

A travelling microscope has 20 divisions per cm on the main scale while its Vernier scale has total 50 divisions and 25 Vernier scale divisions are equal to 24 main scale divisions, what is the least count of the travelling microscope ?

Options

  1. A0 . 001   cm
  2. B0 . 002   mm
  3. C0 . 002   cm
  4. D0 . 005   cm

Correct answer

C. 0 . 002   cm

Step-by-step solution

One main scale division MSD = 1 20   cm One vernier scale division VSD = 24 25 MSD = 24 25 × 1 20   cm ∴ Least count LC = MSD - VSD = 1 20 1 - 24 25 cm = 1 20 × 1 25 = 1 500 = 0 . 002   cm = 0 . 002   cm

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