In a screw gauge, the zero of mainscale ...

In a screw gauge, the zero of mainscale coincides with fifth division of circular scale in figure (i). The circular division of screw gauge are `50`. It moves `0.5 mm` on main scale In one rotation. The diameter of the ball in figure (ii) is

2.25 mm

2.20 mm

1.20 mm

1.25 mm

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