Which of the following is the most precise device for measuring length? (a) A vernier callipers with 20 divisions on the sliding scale (b) A screw gauge of pitch 1 mm and 100 division’s sliding scale on the circular scale (c) An optical instrument that can measure length to within a wavelength of light
![“The distances traversed, during equal intervals o time, by a body falling from rest, stand to one another in the same rate as the odd numbers beginning with unity [namely, 1:3:5:7…..]”. Prove it.](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjzOm5NQTIGTJSjDd0Tot5TRYW-49ut33LKB3WN46H9d517HmYQFLBl7myG9-J86K3lowRZ15zJi5Z0Se-0pin8-lQV7lx9vxQ7VBJLGxaQ3iFX5W3nFyQmYeUMHo8y5Nx7vIDIiTnv2UU/w680/Capture+-+2+%25281%2529.JPG)
 A vernier callipers with 20 divisions on the sliding scale (b) A screw gauge of pitch 1 mm and 100 division’s sliding scale on the circular scale (c) An optical instrument that can measure length to within a wavelength of light){kind=link}
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