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Grade: 11


can any one post the proof:that least count of spherometer is 0.001

9 years ago

Answers : (3)

Sudheesh Singanamalla
114 Points

Least count of a spherometer depends on the device that you have,

normally in labs , the least count is 0.01mm or 0.001cm

least count = pitch / number of divisions on the circular scale head

normally number of divisons on circular scale head is 100

and pitch is 1mm (i.e. on the linear scale)


least count = 1 / 100 = 0.01 mm or 0.001cm


Please approve !

9 years ago
abdul wadood
11 Points
the formula of LC is LC=pitch/no of divisions on circular scale and number of divisions are 100(u can check too)
and pitch means its complete rotation’s impact which is 1mm
so, LC=1/100
      =0.01 mm or 0.001 cm
4 years ago
13 Points
Distance  through which the screw advances on the main scale in 10 rotations of the circular scale l=1cm 
Pitch of the crew therefore p=l/10 =0.1cm 
Total no. Of divisions on circular scale N=100
Least count =P/N=0.1/100=0.001cm 
3 years ago
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