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

Image Formation by Spherical Mirror - GeeksforGeeks

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Draw the lines of symmetry for the following shapes wherever

Reflection of light — Science Learning Hub

How to Make an Infinity Mirror: 13 Steps (with Pictures) - wikiHow

Attenuated Total Reflectance (ATR)

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Absorption and reflection (article), Waves