半径为r的玻璃半圆柱体横截面如图所示圆心为o两条平行单色红光沿截面射�圆柱面方�与底面垂直光线1的入射点a为圆柱面的顶点光线2的 Template




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tomski半径为r的玻璃半圆柱体横截面如图所示圆心为o两条平行单色红光沿截面射�圆柱面方�与底面垂直光线1的入射点a为圆柱面的顶点光线2的 coloring