A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm The main scale reading coincides with 25 divisions above the reference level. If screw gauge has a zero error of -0.004cm, the correct diameter of the ball is [NEET 2018]
a. 0.053 cm
b. 0.525cm
c. 0.521 cm
d. 0.529 cm
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