A) 30 cm
B) 60 cm
C) 15 cm
D) 90 cm
Correct Answer: D
Solution :
\[m=-\frac{1}{2}\] \[\therefore m=\frac{f}{u+f}\]\[\Rightarrow -\frac{1}{2}=\frac{30}{u+30}\]\[\Rightarrow u=\,-\,90\,cm\]You need to login to perform this action.
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