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In an experiment the angles are required...

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

A

half minute

B

one dergree

C

half degree

D

one minutue

Text Solution

Verified by Experts

`29` division of scale coincides with `30` divisions of vernier scale Hence one division of vernier scale
`=(30 - 29)/(30)` of main scale `=(1)/(30) xx 0.5^(@)`
`=(1)/(30) xx 0.5 xx 60 min = 1 min` .
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