Units And Measurements

While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is \(1 \mathrm{~mm}\) and circular scale reading is equal to 42 divisions. Pitch of screw gauge is \(1 \mathrm{~mm}\) and it has 100 divisions on circular scale. The diameter of the wire is \(\frac{x}{50} \mathrm{~mm}\). The value of \(x\) is :