折射包絡線是一條曲線，它是從給定鏡面形狀的指定點（或產生平行光線的無限遠點）發出的光線的包絡。光線發出的點稱為輻射點。折射包絡線是垂足曲線的漸屈線（Lawrence 1972，第 60 頁）。
下表列出了某些常見曲線的折射包絡線，省略了為四葉線列出的不正確的折射包絡線（Lawrence 1972，第 207 頁）。
折射包絡線
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阿特澤瑪螺線, 焦散, 折射焦散線使用 探索
參考文獻
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折射包絡線請引用為
Weisstein, Eric W. “折射包絡線。” 來自 Web 資源。 https://mathworld.tw/Catacaustic.html