To find index error for u when a knitting needle of length `20.0cm` is adjusted between pole and object needle the separation between the indices of o

Monjur Alahi

To find index error for u when a knitting needle of length `20.0cm` is adjusted between pole and object needle the separation between the indices of object needle and mirror was pbserved to be `20.2 cm` Index correction for u is .
A. `-0.2 cm`
B. `0.2 cm`
C. `-0.1 cm`
D. `0.1cm`


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Salim Ahmed Kawsar

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Index error (Excess reading) = Obsorved reading Actual reading
`=20.2 - 20.0 = 0.2cm` .

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