Physics · Units and Measurements

The actual length, breadth, and thickness (l, b, and h) of a rectangular slab are 0.2 m, 0.12 m, and 0.13 m respectively. The length l is measured by a vernier calliper whose zero is to the right of the main scale zero, and the 8th vernier division coincides with a main scale division when the jaws are closed. The breadth b and thickness h are measured by another vernier calliper whose zero shifts to the left when the jaws are closed, and the 4th vernier division coincides with a main scale division. If the least count for both instruments is 0.01 cm, what are the positive and negative zero errors of the respective instruments?