A student performs an experiment of measuring the thickness of a slab with a vernier calliper whose $50$ divisions of the vernier scale are equal to $49$ divisions of the main scale. He noted that zero of the vernier scale is between $7.00\; cm$ and $7.05 \;cm$ mark of the main scale and $23^rd$ division of the vernier scale exactly coincides with the main scale. The measured value of the thickness of the given slab using the calliper will be
  • A$7.23$
  • B$7.023$
  • C$7.073$
  • D$7.73$
NEET 2017, Medium
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