Question

Which measurement is most precise
a) vernier calipers having 5 divisions on sliding scale.
b) vernier calipers having 10 division on sliding scale
c) vernier calipers having 20 division on sliding scale
2)what happened to the accurancy when the least count is decreased ​

Answer 1

Answer:

Most precise device is the one with the minimum least count

1. Vernier Calliper

20 divisions on the sliding scale

L.C=

20

1

mm=0.05mm

2. Screw Gauge

pitch 1 mm and 100 divisions on the circular scale

L.C=

100

1mm

=0.01mm

3.optical instrument

within a wavelength of light

Wavelenght of light ≈ 589nm

Hence Optical instrument is the most precise