A boy uses a vernier calipers to measure the thickness of his pencil. He measures it to be 1.4 mm. If the zero error of vernier calipers is +0.02 cm, what is the correct thickness of pencil?
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Solution
Given: Thickness of the pencil = 1.4 mm Zero error = +0.02 cm Actual thickness = ? Correct reading = observed reading − zero error