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Units and Measurements — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsUnits and Measurements1 Mark
Question
Which of the following is the most precise device for measuring length: an optical instrument that can measure length to within a wavelength of light?
✓

Answer

Wavelength of light, $\lambda\approx10^{-5}\text{cm}=0.00001\text{cm}$ Hence, it can be inferred that an optical instrument is the most suitable device to measure length.

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