The zero of the Vernier scale lies between and of the main scale. The Vernier scale has 50 divisions equivalent to . The 18th division of the Vernier scale exactly coincides with one of the main scale divisions. The diameter of an object is:
The readings on the main scale are 3.25 and 3.30
1 main scale divisions
1 vernier scale division,
Least count
Diameter
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