JEE Main 2021 Physics question
One main scale division of a vernier callipers is 'a' cm and division of the vernier scale coincide with (n – 1)th division of the main scale. The least count of the callipers in mm is :
Answer: (D)
One main scale division of a vernier callipers is 'a' cm and division of the vernier scale coincide with (n – 1)th division of the main scale. The least count of the callipers in mm is :