Question

The smallest division on the main scale of a vernier callipers is $1\text{mm}$ and $10$ vernier divisions coincide with $9$ main scale divisions. While measuring the length of a line, the zero mark of the vernier scale lies between $10.2\text{cm}$ and $10.3\text{cm}$ and the third division of the vernier scale coincides with a main scale division.
(a) Determine the least count of the callipers.
(b) Find the length of the line.

Answer 1