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Parallax

A person take...

Question

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

A

19.70 ml

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B

19.82 ml

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C

19.62 ml

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D

All readings are correct

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Solution

The correct option is A 19.70 ml
When a certain marking/level is viewed from different angles, an apparent change in the position of its reading can be seen. This apparent change in position of the reading is known as parallax error.

The correct way of taking a measurement is when the observer's eye is directly in front of the scale.

Hence, the correct reading is 19.70 ml.

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