A boy uses a vernier callipers to measure the thickness of his pencil. He measure it to be 1.4 mm. If the zero error of vernier callipers is + 0.02 cm what is the correct thickness of pencil

Dear student,
If zero error is positive, then it is subtracted from given reading, while if it is negative, then it is added to observed reading.
Here, observed reading = 1.4 mm
zero error = 0.02 cm = 0.002 mm
Correct thickness = 1.4-0.002 = 1.398 mm

Regards

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