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(A) Vernier callipers with 20 divisions ...

(`A`) Vernier callipers with `20` divisions on sliding scale, coinciding with `19` main scale divisions
(`B`) A screw gauge of pitch `1 mm` and `100` divisons 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 devide for measuring length is

A

`A` only

B

`B` only

C

`C` only

D

All are equally accurate

Text Solution

Verified by Experts

The correct Answer is:
C
`LC` of `A=0.005 cm`
`LC` of `B=0.001 cm`
Wavelength of light `=`
`10^(-5)cm=0.00001cm`
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