Can there be 20 vernier scale divisions if the main scale has 18 divisions?

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Solution

Yes, it can be possible.
In this case, 20 Vernier divisions coincide exactly with 18 main scale division.
Thus,

20 VSD coincides with 18 MSD (in mm)

1 VSD coincide with 18/20 MSD

Least Count (L.C.) = MSD – VSD
Hence, LC = 1 – 18/20 = 0.1 mm

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Can there be 20 vernier scale divisions if the main scale has 18 divisions?

Yes, it can be possible. In this case, 20 Vernier divisions coincide exactly with 18 main scale division. Thus, 20 VSD coincides with 18 MSD (in mm) 1 VSD coincide with 18/20 MSD Least Count (L.C.) = MSD – VSD Hence, LC = 1 – 18/20 = 0.1 mm

Yes, it can be possible.
In this case, 20 Vernier divisions coincide exactly with 18 main scale division.
Thus,

20 VSD coincides with 18 MSD (in mm)

1 VSD coincide with 18/20 MSD

Least Count (L.C.) = MSD – VSD
Hence, LC = 1 – 18/20 = 0.1 mm