In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There…

In a screw gauge the zero of main scale reference line coincides with the fifth division of the circular scale when two studs are in contact. There are $\displaystyle 100$ divisions in circular scale and pitch of screw gauge is $\displaystyle 0.1$ mm. When diameter of a sphere is measured, the reading of main scale is $\displaystyle 5$ mm and $\displaystyle 50^{\text {th }}$ division of circular scale coincides with the reference line of main scale. The diameter of sphere is $\displaystyle \_\_\_\_$ mm.