A) \[30cm\]
B) \[90cm\]
C) \[120cm\]
D) \[60cm\]
Correct Answer: B
Solution :
\[m=\frac{f}{(f-u)}\Rightarrow \left( +\frac{1}{4} \right)=\frac{(+30)}{(+30)-u}\Rightarrow u=-\ 90\ cm\]You need to login to perform this action.
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