Q7 In a vernier calipers, there are 10 divisions on the vernier scale and 1cm on the main scale is divided in 10 parts. While measuring a length, the zero of the vernier lies just ahead of 1.8cm mark and 4th division of vernier coincides with a main scale division.
(a) Find the length
(b) If zero of vernier calipers is -0.02cm, what is the correct length?

Solution