Which of the following is the most precise device for measuring l… - Vidyadip

MCQ

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 $100$ divisions on the circular scale
✓
an optical instrument that can measure length to within a wavelength of light
D
Precison can not be changed by changing the instrument.

✓

Answer

Correct option: C.

an optical instrument that can measure length to within a wavelength of light

c

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