A) + 15 cm
B) -15 cm
C) + 30 cm
D) -30 cm
Correct Answer: D
Solution :
\[\frac{1}{F}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}=\frac{1}{60}+\frac{1}{(-20)}\Rightarrow F=-30\]You need to login to perform this action.
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