The critical plane of focus is where the number 4 is due to it being the sharpest point.
Here, the critical plane of focus is the 1 because it is noticeably sharper here while the rest of the numbers are blurry.
For this last photo I went a bit over the ruler to get more of it in frame. Here, you can see that the 10 is sharp while the numbers following it get blurry as you progress down.
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