Question:
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 $\left(=0.5^{\circ}\right)$, then the least count of the instrument is:
halfminute
one degree
half degree
one minute
Question of from chapter.
JEE Main Previous Year 2009
Correct Option: 4
Solution:
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