Question

In a vernier callipers, 19 main scale divisions coincide with 20 vernier scale divisions. If the main scale has 20 divisions in a centimetre, calculate

1. pitch
2. L.C. of vernier callipers.

Answer 1

Main scale divisions of vernier callipers in one centimetre = 20 Unit

Pitch = `"Unit of main scale"/"Number of divisions in the unit"`

= `1/20` cm

= 0.05 cm

Least count = `"Pitch"/"No. of vernier scale divisions"`

= `0.05/20`

= 0.0025 cm