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Parallax Error

Three boys A,...

Question

Three boys A, B and C got the readings 8.2 cm, 8.3 cm and 8.5 cm respectively. Who got the correct reading?

A

All of them are correct with their readings

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B

A got the correct reading

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C

B got the correct reading

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D

C got the correct reading

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Solution

The correct option is C B got the correct reading

The difference in the reading of scale is due to different angle of vision. Parallax error is apparent change in position of the reading as viewed from different angles.

The correct way of taking a measurement is when the observer's eye is directly in line with the marking, making 90 degrees with the scale as in B's case.

Hence, the correct reading is 8.3 cm.

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