题目内容
（请给出正确答案）
[单选题]
用正交方向曲率不等的凸柱面透镜模拟散光眼，其正交方向焦距分别为f =26.6cm、F=40.0cm。则应该给该“散光眼”配什么样的透镜？ A convex cylindrical lens with different curvature in orthogonal direction is used to simulate astigmatism. The focal length in orthogonal direction is f = 26.6cm and F = 40.0cm respectively. What kind of lens should be used for the astigmatism eye？
A.焦距为+80cm的凸透镜 Convex lens with focal length of + 80cm
B.焦距为+40cm的凸圆柱透镜 Convex cylindrical lens with focal length of + 40cm
C.焦距为-40cm的凹圆柱透镜 Concave cylindrical lens with focal length of - 40cm
D.焦距为+80cm的凸圆柱透镜 Convex cylindrical lens with focal length of + 80cm
答案
A、焦距为+80cm的凸透镜 Convex lens with focal length of + 80cm
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