Question

A vernier calipers or an optical instrument which is more precise

Answer 1

The most precise device is the one having minimum least count...

for example...if we use vernier callipers for measuring length...

.least count of vernier callipers is

=value of a division on main scale/no. of divisions on sliding scale

=1mm/20=5*10(-2)mm

but if we use an optical instrument for measuring length to within a wavelength of light is

5000*10^-10m=10^-6m=10^(-3)mm

hence...the optical instrument is most precise...

hope...u get ur answer..

Answer 2

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Clearly the optical instrument is most precise because its least count is least.