Which of the following is the most precise device for measuring length (i) a vernier calipers with 20 divisions on the sliding scale (ii) a screw gauge of pitch 1mm and 100 divisions on the circular scale (iii) an optical instrument that can measure length to within a wavelength of light?

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

1.	Which of the following is the most precise device for measuring length (i) a vernier calipers with 20 divisions on the sliding scale (ii) a screw gauge of pitch 1mm and 100 divisions on the circular scale (iii) an optical instrument that can measure length to within a wavelength of light?
Answer» <html><body><p><a href="https://interviewquestions.tuteehub.com/tag/vernier-1444853" style="font-weight:bold;" target="_blank" title="Click to know more about VERNIER">VERNIER</a> calipers<br/>Screw guage<br/>Optical instrument<br/>All the above</p>Answer :<a href="https://interviewquestions.tuteehub.com/tag/c-7168" style="font-weight:bold;" target="_blank" title="Click to know more about C">C</a></body></html>