Mirror lines can be placed anywhere you just reflect

Mirror lines can go anywhere, through the object, next to, diagonally, you just have to reflect the object on one side through to the other side

Reflecting shapes (article), Reflections

Reflection

Attenuated Total Reflectance (ATR)

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Mirror lines can be placed anywhere you just reflect

Reflection of light — Science Learning Hub

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Reflection

Multiple Reflections of Light - GeeksforGeeks