In a vernier callipers, each $cm$ on the main scale is divided into $20$ equal parts. If tenth vernier scale division coincides with nineth main scale division. Then the value of vernier constant will be $\dots \; \times 10^{-2} \;mm$
  • A$3$
  • B$5$
  • C$7$
  • D$9$
JEE MAIN 2022, Medium
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