Question

A specially designed Vernier calliper has the main scale least count of 1 mm. On the Vernier scale, there are 10 equal divisions and they match with 11 main scale divisions. Then, the least count of the Vernier calliper is

(a) 0.1 mm

(b) 0.909 mm

(c) 1.1 mm

(d) 0.09 mm

Answer 1

Answer is : (a) 0.1 mm

Here, 10 divisions of vernier scall = 11 main scale divisions

So, 1 vernier scale division = 11/10 main scale divisions

Now, we use formula for least count, Least count = 1 main scale division − 1 vernier scale division.

So, magnitude of least count is 0.1 mm.