A) 10 cm
B) 20 cm
C) 5 cm
D) 25 cm
Correct Answer: B
Solution :
Given, \[f=10\text{ }cm,\text{ }u=-20\text{ }cm\] \[\therefore \] \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] \[\Rightarrow \] \[\frac{1}{10}=\frac{1}{v}-\left( -\frac{1}{20} \right)\] \[\frac{1}{v}=\frac{1}{10}-\frac{1}{20}=\frac{1}{20}\] \[v=20cm\]You need to login to perform this action.
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