Question

A vernier callipers 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 callipers, the least count is,​

Answer 1

Answer:

Explanation: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

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