Question

A vernier caliper has 1 mm marks on the main scale. It has 20 equal divisions on the vernier scale which match with 16 main scale divisions. For this vernier caliper, the least count is give me a answer

Answer 1

Answer:

Least count means smallest length that can be measured using an instrument.

A vernier callipers has two scales:

1. The main scale

2.The vernier scale.

Now we know that Least count = 1 main scale division - 1 vernier scale division

Generally in a vernier callipers N main scale divisions coincide with N-1 vernier scale divisions.

But acc to our question,

20 VSD coincides with 16 MSD

Therefore, Least Count = 1 MSD - 1VSD = 1mm - (16/20)*1mm = 4/20 mm = 0.2mm that is option D.

Hence the Least Count of the Vernier Callipers is 0.2 mm