What is the principle of vernier calipers?

Vernier Calliper

Vernier Calliperes

What is the use of a vernier calliper?

The smallest division on the main scale of a vernier calipers is 0.1cm. Ten divisions of the vernier scale correspond to nine divisions of the main scale. The figure below on the left shows the reading of this calipers with no gap between in two jaws. The figure on the right shows the reading with a solid sphere held between the jaws. The correct diameter of the sphere is.

(M - 1) divisions on the main scale of a vernier calipers coincide with M divisions on the vernier scale. If each division on the main scale is of b unit, then least count of instrument is b M +1 b O M b M-1 1 O M

What is the reading of vernier scale shown in figure?

Marks on main scale of vernier caliper are made at 1mm separation. There are 25 equal divisions on vernier scale and the same matches with 20 divisions on main scale. What is the least cound of given vernier caliper?

Which of the following equations is are true with reference to a vernier calipers?