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Question
Name the two scales of a vernier callipers and explain how it is used to measure length correct up to 0.01 cm.
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Solution
Two scales of vernier calipers are
(a) Main scale
(b) Vernier scale
The main scale is graduated to read up to 1 mm and on vernier scale, the length of 10 divisions is equal to the length of 9 divisions on the main scale.
Value of 1 division on the main scale = 1 mm
Total no. of divisions on the vernier scale = 10
Thus, L.C. = 1 mm /10 = 0.1 mm = 0.01 cm.
Hence, a vernier callipers can measure length correct up to 0.01 cm.
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