折射包络线是一条曲线，它是从给定镜面形状的指定点（或产生平行光线的无限远点）发出的光线的包络。光线发出的点称为辐射点。折射包络线是垂足曲线的渐屈线（Lawrence 1972，第 60 页）。
下表列出了某些常见曲线的折射包络线，省略了为四叶线列出的不正确的折射包络线（Lawrence 1972，第 207 页）。
折射包络线
另请参阅
阿特泽玛螺线, 焦散, 折射焦散线使用 探索
参考文献
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折射包络线请引用为
Weisstein, Eric W. “折射包络线。” 来自 Web 资源。 https://mathworld.net.cn/Catacaustic.html