A) ? 20 cm
B) + 20 cm
C) ? 10 cm
D) + 10 cm
Correct Answer: A
Solution :
By using \[\frac{{{\omega }_{1}}}{{{f}_{1}}}+\frac{{{\omega }_{2}}}{{{f}_{2}}}=0\]\[\Rightarrow \frac{0.02}{{{f}_{1}}}+\frac{0.04}{40}=0\] \[{{f}_{1}}=-20\,cm\]You need to login to perform this action.
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