Question

Choose the correct answer:
1. Which of the following is the most precise
instrument for measuring the length?​

Answer 1

Answer:

Venier callipers measures length precisely.

Answer 2

Answer:

(a) Least count of vernier callipers.

Least count of vernier callipers.(b) Least count of screw gauge

Least count of vernier callipers.(b) Least count of screw gauge (c) Least count of optical instrument

Least count of vernier callipers.(b) Least count of screw gauge (c) Least count of optical instrument = Wavelength of visible (red) light

Least count of vernier callipers.(b) Least count of screw gauge (c) Least count of optical instrument = Wavelength of visible (red) light= 0.00006 cm.

Hence the most precise device for measuring length is the given optical instrument.