In an experiment with vernier calipers of least count \( 0.1 \, \text{mm} \), when two jaws are joined together the zero of vernier scale lies right to the zero of the main scale and \( 6^{\text{th}} \) division of vernier scale coincides with the main scale division. While measuring the diameter of a spherical bob, the zero of vernier scale lies in between \( 3.2 \, \text{cm} \) and \( 3.3 \, \text{cm} \) marks, and \( 4^{\text{th}} \) division of vernier scale coincides with the main scale division. The diameter of bob is measured as:
