Which of the following is the most precise device for measuring length 
  • Aa vernier callipers with $20$ divisions on the sliding scale
  • Ba screw gauge of pitch $1\,\, mm$ and $100$ divisions on the circular scale
  • C
    an optical instrument that can measure length to within a wavelength of light
  • D
    Precison can not be changed by changing the instrument.
Medium
art

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