A) 45 cm
B) ? 20 cm
C) ? 12 cm
D) 30 cm
Correct Answer: C
Solution :
For lens u = want?s to see \[=-\,60\,cm\] v = can see \[=-\,10\,cm\] \[\therefore \frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]\[\Rightarrow \frac{1}{f}=\frac{1}{-10}-\frac{1}{(-60)}\]\[\Rightarrow f=-\,12\,cm\]You need to login to perform this action.
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