Suppose the value of one division of vernier scale is 0.5mm and the value of one main scale

division is 0.49mm, what is the least count of the instrument in millimeter

-0.01 mm

Explanation:

We are given that

The value of one division of vernier scale = 0.5 mm

The value of one main scale division=0.49 mm

We have to find the value of least count of the instrument in mm.

We know that

Leas count of vernier caliper=1 main scale division-1 vernier scale division

Least count of vernier caliper=0.49-0.50=-0.01 mm

Hence, the least count of the instrument=-0.01 mm

Answer: - 0.01 mm