A) - 4 cm
B) 8 cm
C) 6 cm
D) 12 cm
Correct Answer: A
Solution :
Magnification \[m=-\frac{\upsilon }{u}\] \[\upsilon =3u\] \[(\therefore m=3\] \[\frac{1}{\upsilon }+\frac{1}{u}=\frac{1}{f}\] \[\frac{1}{3u}+\frac{1}{u}=4\] \[\Rightarrow \] \[\,u=-4\,cm\]You need to login to perform this action.
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