A person takes three measurements in different angles as shown in the figure. Which of the readings is correct?

19.82 ml

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19.70 ml

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19.62 ml

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None of the above

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Solution

The correct option is B 19.70 ml
Parallax error is apparent change in position of the reading as viewed from different angles. The correct way of taking a measurement is the when the observer's eye is directly in front of the scale.
Hence, the correct reading is 19.70 ml.

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