A) + 1 D
B) - 1 D
C) zero
D) - 0.5 D
E) None of these
Correct Answer: D
Solution :
\[P={{P}_{1}}+{{P}_{2}}\] \[=\frac{100}{{{f}_{1}}}+\frac{100}{{{f}_{2}}},\]both \[{{f}_{1}}\] and \[{{f}_{2}}\] are in cm. \[=\frac{100}{50}-\frac{100}{40}\]\[=2-2.5=-\,0.5\,D\]
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