A) \[m=\frac{f-u}{f}\]
B) \[m=\frac{f}{f-u}\]
C) \[m=\frac{f+u}{f}\]
D) \[m=\frac{f}{f+u}\]
Correct Answer: B
Solution :
\[\because m=-\frac{v}{u}\] also \[\frac{1}{f}=\frac{1}{v}+\frac{1}{u}\] Þ \[\frac{u}{f}=\frac{u}{v}+1\] Þ \[-\frac{u}{v}=1-\frac{u}{f}\]\[\Rightarrow \frac{-v}{u}=\frac{f}{f-u}\] so \[m=\frac{f}{f-u}\].You need to login to perform this action.
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