A) 4.5 D
B) 18 D
C) 45 D
D) 2.5 D
E) 9 D
Correct Answer: E
Solution :
\[{{P}_{1}}=\frac{100}{20}=5D,{{P}_{2}}=\frac{100}{25}=4D\] Effective power \[P={{P}_{1}}+{{P}_{2}}\] \[=5+4\] \[=9D\]
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