Explain me this!! Vernier scale division 6:52 pm + Measurements and Experimention CONCEPTS TESTS REVISION Vernier Calliper For measuring - Physics - Measurements and Experimentation

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Explain me this!! Vernier scale division

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Vernier Calliper For measuring length accurately, Vernier calliper is used Vernier calliper was invented by Pierre Vernier It has accuracy up to 0 01 cm Essential Parts:

Main Scale It is a thin long strip of steel on which a scale in engraved in mm The main scale is generally 15 cm long Vernier Scale It is a small movable scale, which slides along the main scale It has 10 divisions adding up to 9 mm length External jaws J 1 and J 2 are called external jaws because they are used for measuring external dimensions Internal jaws J 3 and J 4 are collectively called internal jaws and are used for measuring internal dimensions of a hollow object Tail It is at the end of main scale and slides along with the Vernier scale When jaws J 1 and J 2 are closed, the zero mark of the main scale coincides with that of the Vernier scale and 19 thmain scale divisions coincide with 20 th Vernier scale divisions Terms and Definitions: Pitch The smallest value of length, which can be acquired directly from the main scale accurately, is called pitch Least Count The magnitude of the smallest measurement, which can be measured by an instrument accurately, is called its least count Formula for measuring a length Length of an object is found by using the formula, Length = (Pitch × Main Scale Division) + (Least Count × Vernier Scale Division) Zero Error of Vernier Calliper If the zeroes of M S and V S do not coincide, then the instrument is said to have a zero error Positive Zero Error If the zero mark of the Vernier scale lies on right hand side of zero mark of the main scale, then the error is said to be positive and correction is said to be negative

Correction = −Coinciding division of V S × L C This correction has to be added to the measured length Negative Zero Error If the zero mark of the Vernier scale lies on left hand side of zero mark of the main scale, then the error is said to be negative and correction is said to be positive

Correction = ( n − Coinciding division of V S ) × L C Where, n is the total number of Vernier scale divisions Regards