俱舍論疏 8.171

8.171

論「言像不成至無二並故」，此無二並，總有四種：一鏡像色別無二並、二兩岸像色無二並、三影光處別無二並、四月像鏡面無二並。

On the passage in the śāstra from "Saying that the reflection is unestablished" to "because two cannot coexist": For this absence of two coexisting, there are four types in total: first, the color-form of the mirror and the reflection are distinct and two cannot coexist; second, the color-forms of reflections from two banks cannot coexist; third, shadow and light occupy different places and two cannot coexist; fourth, the reflection of the moon and the mirror surface cannot coexist.