1.

Which of the following is preciseA vernier calliperse with 40 divisions on sliding scaleAn optical instrument that can measure length of the order of wavelength of light.Is it possible to increase the accuracy of screw gauge by increasing the number of divisions on the head scale?

Answer»

1. (i) L.C of vernier caliperse = 140 = 0.025mm

= 0.025 × 10-3m

= 2.5 × 10-5m.

(ii) L.C of optical instrument = 6000A°

= 6000 × 10-10m

(Taking λ of visible light = 6000°A)= 6 × 10-7m

2. Yes. Because L.C proportional to number of division on the headscale. So with the increase in number of divisions, the least count will increase. This leads to increase the accuracy of above screw guage.



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