A) 20 cm
B) 10 cm
C) 40 cm
D) 30 cm
Correct Answer: A
Solution :
\[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\] (Given \[u=-20\]cm, \[f=10\]cm, \[v=?\]) \[\therefore \] \[\frac{1}{10}=\frac{1}{v}-\frac{1}{(-20)}\Rightarrow v=20\,cm\]You need to login to perform this action.
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