A) + 1.5
B) ? 1.5
C) + 6.67
D) ? 6.67
Correct Answer: B
Solution :
Power of convex lens \[{{P}_{1}}=\frac{100}{40}=2.5\ D\] Power of concave lens \[{{P}_{2}}=-\frac{100}{25}=-\ 4\ D\] Now \[P={{P}_{1}}+{{P}_{2}}=2.5\ D-4\ D=-\ 1.5\ D\]
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