Question

The main scale of a vernier callipers is calibrated in mm and 19 divisions of main scale are equal in length to 20 divisions of vernier scale. In measuring the diameter of a cylinder by this instrument, the main scale reads 35 divisions and the 4th division of vernier scale coincides with a main scale division. Find :(i) least count and (ii) radius of cylinder.​

Answer 1

Answer:

35.2 mm

Step-by-step explanation:

L. C. of vernier scale = 1 mm / 20 = 0.05 mm

L. C. of main scale = 1 mm

Main scale reading = 35 × 1 mm = 35 mm

Vernier scale reading = 4 × 0.05 mm = 0.2 mm

Reading = 35 mm + 0.2 mm = 35.2 mm

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