If $50$ Vernier divisions are equal to $49$ main scale divisions of a travelling microscope and one smallest reading of main scale is $0.5 \mathrm{~mm}$, the Vernier constant of travelling microscope is:
  • A$0.1 \mathrm{~mm}$
  • B$0.1 \mathrm{~cm}$
  • C$0.01 \mathrm{~cm}$
  • D$0.01 \mathrm{~mm}$
JEE MAIN 2024, Diffcult
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