Q. A student measures the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 10 mm and with 25th divisions coincides with reference line. The correct diameter of the ball is (Number of circular scale division is 50). (1) 1.35 cm (2)1.025 cm (3)1.25 cm (4) 1.42 cm​