用“插针法”测定透明半圆柱玻璃砖的折射率,O为玻璃截面的圆心

插针法测定透明半圆柱玻璃砖的折射率,O为玻璃截面的圆心,使入射光线跟玻璃砖平面垂直,图中的P1P2P3P4是四个学生实验时插针的结果。 在这四个图中可以比较准确地测定折射率的是        

答案

CD

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