A) Concave, ? 1.0 D
B) Convex, + 1.5 D
C) Concave, ? 2.0 D
D) Convex, + 2.0 D
Correct Answer: C
Solution :
For correcting myopia, concave lens is used and for lens. u = wants to see \[=-\,50\,cm\] v = can see \[=-\,25\,cm\] From \[\frac{1}{f}=\frac{1}{v}-\frac{1}{u}\]\[\Rightarrow \frac{1}{f}=\frac{1}{-25}-\frac{1}{(-50)}\]\[\Rightarrow f=-\,50\,cm\] So power \[P=\frac{100}{f}=\frac{100}{-50}=-\,2\,D\]You need to login to perform this action.
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