Question

A) Vernier caliper with 20 divisions on sliding scale, coinciding with 19 main scale divisions

B) A screw gauge of pitch 1mm and 100 divisions on the circular scale

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

Out of A, B and C the most precise device for measuring length is

1) A only

2) B only

3) C only

4) All are equally accurate​

Answer 1

Answer:

B... is correct............

Explanation:

B