Which of the following is the most precise de | vedclass

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(C) The precision of a measuring instrument is determined by its least count. The smaller the least count,the more precise the instrument is.$1$. For

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An optical instrument that can measure length to within a wavelength of light.

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(C) The precision of a measuring instrument is determined by its least count. The smaller the least count,the more precise the instrument is.$1$. For the vernier callipers,if we assume a standard main scale division of $1 \, mm$,the least count is $1 \, mm / 20 = 0.05 \, mm$.$2$. For the screw gauge,the least count is $	ext{pitch} / 	ext{number of divisions} = 1 \, mm / 100 = 0.01 \, mm$.$3$. For the optical instrument,the least count is on the order of the wavelength of light,which is approximately $10^{-7} \, m$ or $0.0001 \, mm$.Comparing these,$0.0001 \, mm < 0.01 \, mm < 0.05 \, mm$. Therefore,the optical instrument is the most precise.

Which of the following is the most precise device for measuring length?

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