A) 100cm
B) 100 cm
C) \[-1\text{ }cm\]
D) \[\frac{100}{-9}\]cm
Correct Answer: B
Solution :
Power of combination \[P={{P}_{1}}+{{P}_{2}}\] \[\Rightarrow \] \[4=5+{{P}_{2}}\] \[\Rightarrow \] \[{{P}_{2}}=4-5=-1\,D\] \[\therefore \] \[-1={{P}_{2}}=\frac{100}{f(cm)}\] \[\Rightarrow \] \[f=-100\,cm\]You need to login to perform this action.
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