A) 50 cm
B) 30 cm
C) ? 50 cm
D) ? 30 cm
Correct Answer: D
Solution :
For real image \[m=-\,2\] \[\therefore m=\frac{f}{u+f}\]\[\Rightarrow -\,2=\frac{f}{u+f}=\frac{20}{u+20}\]Þ u = ? 30 cm.You need to login to perform this action.
You will be redirected in
3 sec