The smallest division on the main scale of a Vernier callipers is 1 mm and 10 vernier divisions coincide with 9 main scale divisions. While measuring the diameter of a ring, the zero mark of the vernier scale lies between 5.0 cm and 5.1 cm the eighth division of the vernier scale coincides with a main scale division. The diameter of the ring is :
5. 06 cm
5. 08 cm
5. 04 cm
5. 02 cm
10VSD = 9 MSD
1VSD = 0.9 MSD
LC = 1 MSD – 1VSD = 0.1 mm
Main reading = 5 cm + 0.1 mm × 8 = 5.08 cm
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