Vฤn Sแปญu
@vansuu
gm (good math!) https://www.brunogavranovic.com/posts/2022-02-10-optics-vs-lenses-operationally.html
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Xanh ๐ญ๐ญ
@xanh
I feel happy and lucky to have you by my side. ๐๐๐ Ka-ching!
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