A) Convex lens
B) Concave lens
C) Cylindrical lens
D) Toric lens
Correct Answer: B
Solution :
In myopia, \[u=\infty ,\] \[v=d=\]distance of far point By \[=\frac{2\ N.A.}{1.22\ \lambda }\Rightarrow R.P.\propto N.A.\] we get \[f=-\ d\] Since f is negative, hence the lens used is concave.
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