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In an experiment the angles are required to be measured using an instrument. 29 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale. If the smallest division of the main scale is half-a-degree (=0.5^ ) , then the least count of the instrument is

Options

  1. Aone minute
  2. Bhalf minute
  3. Cone degree
  4. Dhalf degree

Correct answer

A. one minute

Step-by-step solution

Least count = value of main scale division No of divisions on vernier scale = 1 30 MSD = 1 30 1 2 ^ = 1 60 ^ =1 minute

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