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| 1. |
Which of the following is the most recise device for measuring length?A. A vernier calliper with 20 divisioins of the sliding scaleB. An optical insturment that can measure length within wavelength of lightC. A screw gauge of pitch `1mm` and 100 division on the circular scaleD. None of the above |
| Answer» (b) An optical instrument gives most precise measurement. | |