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Parallax

A person take...

Question

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

A

19.82 ml

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B

19.70 ml

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C

19.62 ml

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D

None of the above

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Solution

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

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