Question

A screw gauge with a pitch of 0.5 mm and a circular scale with 50 divisions is used to measure the thickness of a thin sheet. Before starting the measurement it is found that when the two jaws of the screw gauge are brought in contact the 45th division concides with the main scale line and that the zero of the main scale is barely visible. The thickness of the sheet if the main scale reading is 0.5 mm and the 25th division on circular scale coincides with the main scale line is

Answer 1

0.6mm is the answer.