A) 1 D
B) - 1 D
C) 0.5 D
D) -0.5 D
Correct Answer: A
Solution :
\[P={{P}_{1}}+{{P}_{2}}\]\[=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}=\frac{1}{(0.5)}+\frac{1}{(-1)}=1\,D\]
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