To find index error v when the same knitting needle is adjusted between the pole and the image needle the separation between the indices of image need

Monjur Alahi

To find index error v when the same knitting needle is adjusted between the pole and the image needle the separation between the indices of image needle and mirror was found to be `19.9 cm` Index error for v is .
A. `0.1 cm`
B. `-0.1 cm`
C. `0.2 cm`
D. `-0.2 cm`


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Salim Ahmed Kawsar

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Correct Answer - B
`e = 19.9 cm - 20.0 cm = - 0.1 cm`

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