A) 25.6 cm
B) 37.5 cm
C) 75.2 cm
D) 100.4 cm
Correct Answer: B
Solution :
The given, \[u=-75\,cm\] \[v=75\,cm\] \[f=?\] \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] \[\frac{1}{f}=\frac{1}{75}+\frac{1}{75}\] \[\frac{1}{f}=\frac{1+1}{75}\] \[f=\frac{75}{2}=37.5\,cm\]You need to login to perform this action.
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