The number of division on vernier scale is 20, Find the least count of the vernier calliper

0.2 mm

Explanation:

Assuming the Caliper has 1 mm marks on the main scale. Again, we assume that the 20 division coincides with the 16 main scale division, then we can find the least count by saying

For the given Vernier calipers,

Let one main scale division be = 1 mm.

Since there are 20 Vernier scale divisions that happen to be equal to 16 Main Scale Divisions, we can calculate that

1 Vernier Scale Division = 16/20 Main Scale Division

1 Vernier Scale Division = 0.8 mm.

The least count is finally calculated by saying that

Least Count = 1 Main Scale Division - 1 Vernier Scale Division

Least Count = 1 - 0.8

Least Count = 0.2 mm

Therefore, from the assumptions made above, the least count is 0.2 mm

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