The diameter of a cylinder is measured using a Vernier calipers with no zero error. It is found that the zero of the Vernier scale lies between 5.10 cm and 5.15 cm of the main scale. The Vernier scale has 50 divisions equivalent to 2.45 cm. The 24th division of the Vernier scale excatly coincides with one of the main scale divisions. The diameter of the cylinder is :-
We can see that,
Given that ("It is found that the zero of the Vernier scale lies between 5.10 cm and 5.15 cm of the main scale.")
1MSD=0.05 cm
Vernier scale has 50 divisions equivalent 2.45 cm.
50 divisions =2.45 cm
⇒ 1 division =2.4550=0.049 cm
⇒ least count 1 MSD−1 VSD=0.05−0.049=0.001 cm
Final reading =MSR+L.C×VSR
=5.10+0.001×24
=5.124 cm