A) + 6.5 D
B) ? 6.5 D
C) + 7.5 D
D) ? 0.75 D
Correct Answer: D
Solution :
\[\frac{1}{F}=\frac{1}{{{f}_{1}}}+\frac{1}{{{f}_{2}}}\Rightarrow \frac{1}{F}=\frac{1}{+80}+\frac{1}{-50}\] \[\Rightarrow \] \[F=-\frac{400}{3}\Rightarrow P=\frac{-\,3}{4}D\]You need to login to perform this action.
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