A direct vernier has 40 VSD equal to 38 MSD. If 1 MSD = 0.5 mm, a reading is obtained with MSR = 12.0 mm and the 31st vernier division coinciding. The instrument has +0.10 mm zero error. The corrected reading is:
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Question

A direct vernier has 40 VSD equal to 38 MSD. If 1 MSD = 0.5 mm, a reading is obtained with MSR = 12.0 mm and the 31st vernier division coinciding. The instrument has +0.10 mm zero error. The corrected reading is:

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G1 Physics · Accepted Answer

1 VSD = (38/40)(0.5) = 0.475 mm. LC = 0.5 − 0.475 = 0.025 mm. Observed reading = 12.0 + 31(0.025) = 12.775 mm. Corrected reading = 12.775 − 0.10 = 12.675 mm.