A) 12 cm
B) 30 cm
C) 50 cm
D) 60 cm
Correct Answer: C
Solution :
The lens formula is \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] we have \[u=-30\,cm,\,\,f=20\,cm\] \[\therefore \frac{1}{20}=\frac{1}{v}-\frac{1}{-30}\] or \[\frac{1}{v}=\frac{1}{20}-\frac{1}{30}=\frac{3-2}{60}=\frac{1}{60}\] \[\therefore v=60\,cm\] The ray diagram for the problem is shown as follows:You need to login to perform this action.
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