A) Zero
B) Infinity
C) 10 cm
D) 20 cm
Correct Answer: B
Solution :
\[f=\frac{{{f}_{1}}\,{{f}_{2}}}{{{f}_{1}}+{{f}_{2}}}=\frac{10(-10)}{10+(-10)}=\frac{-100}{10-10}=\]\[\infty \]You need to login to perform this action.
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