Question

A Vernier caliper has 1 mm marks on the main scale. It has 20 equal divisions on the Vernier scale which matches with 16 main scale divisions. For this Vernier caliper, the least count is:

• A. 0.02 mm
• B. 0.05 mm
• C. 0.1 mm
• D. 0.2 mm

Answer 1

The correct option is D

0.2 mm

Least count is the difference between one main scale division and vernier scale division L.C. = 1 MSD - 1 VSD

Given,

20 V.S.D = 16 M.S.D

$1V.S.D=\frac{16}{20}M.S.D$

L.C. = 1 MSD - 1 VSD = $\frac{4}{20}$M.S.D

$=\frac{1}{5}M.S.D$

1 M.S.D is given by 1mm

$\Rightarrow L.C.=\frac{1}{5}\times 1mm=0.2mm$