A) A concave lens of focal length \[2\text{ }m\]
B) A concave lens of focal lens \[\text{4 }m\]
C) A convex lens of focal lens \[2\text{ }m\]
D) A concave lens of focal length \[\text{1 }m\]
Correct Answer: A
Solution :
\[P={{P}_{1}}+{{P}_{2}}\] \[{{P}_{2}}=P-{{P}_{1}}\] \[=1.5-2\] \[=-0.5\] diopter \[{{P}_{2}}\] is a concave lens \[f=\frac{1}{P}\] \[{{f}_{2}}=\frac{1}{0.5}\] \[=-2\,m\]
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