Why should the eye s of the observers coincide with the mercury in the capillary tube?
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Hy,
The answer to this question is that to prevent any refractory error in reading of mercury by the observer.
Hope it helps
Regards
Dr Chinmay
The answer to this question is that to prevent any refractory error in reading of mercury by the observer.
Hope it helps
Regards
Dr Chinmay
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to avoid parallax error
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