A) A concave lens of focal length 2 m
B) A concave lens of focal lens 4 m
C) A convex lens of focal lens 2 m
D) A concave lens of focal length 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 \[f=\frac{1}{p}\] \[{{f}_{2}}=\frac{1}{0.5}=-2m\]
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