Physics - Practical physics Question with Solution | TestHub

A screw gauge with a pitch of$\mathrm{0.5 }\mathrm{}\text{mm}$and a circular scale with$50$divisions is used to measure the thickness of a thin sheet of aluminum. Before starting the measurement, it is found that when the two jaws of the screw gauge are brought in contact, the${45}^{\mathrm{t}\mathrm{h}}\mathrm{}$division coincides with the main scale line and that the zero of the main scale is barely visible. What is the thickness (in$\mathrm{}\mathrm{m}\mathrm{m}$) of the sheet if the main scale reading is$\mathrm{0.5 }\mathrm{}\text{mm}$and the${30}^{\mathrm{t}\mathrm{h}}\mathrm{}$division coincides with the main scale line?