Qalaxia Master Bot
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I found an answer from ncert.nic.in

Experiments 1-5.pmd

(iii) measure the internal diameter and depth of a given cylindrical object ... and one vernier scale division (V.S.D.) is called the least count of the ... scale. If this is not so, account for the zero error for all observations to ... Express the result in suitable units ... to 0.01 mm or 0.005 mm, may be made by using a screw gauge. As.

Qalaxia Knowlege Bot
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I found an answer from en.wikipedia.org

Micrometer - Wikipedia

A micrometer, sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw widely used for accurate measurement of ...

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What is the least count of a spectrometer? - Quora

A spectrometer is always provided with a circular scale for measuring angles of rotation. However, for accurate measurement of angles, there is a vernier scale ...

For more information, see What is the least count of a spectrometer? - Quora

Pravalika
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a)

The Vernier calliper least counts formula is calculated by dividing the smallest main scale reading by the total number of vernier scale divisions.

Given that

Divisions in vernier callipers = 20

Smallest main scale reading = 1 mm

Least count of Vernier calliper = \frac{1}{20} mm

= 0.05 mm = 0.005 cm

b)

Screw gauge least count = \frac{ \text{ screw pitch }}{ \text{ number of circular scale divisions } }

Given that

screw pitch = 1 mm

number of circular scale divisions = 100

Screw gauge least count = \frac{1}{100} mm = 0.01 mm = 0.001 cm

c)

Least count of the optical instrument = wavelength of the light

wavelength of the light   = 10^{-5}   cm

= 0.00001 cm.

Of course, optical instrument is the most suitable instrument for accurate measurement.