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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.
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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