Fenics test convergence using errornorm

Hi, I am trying to test if the mesh is fine enough by generating meshes of different numbers of nodes and then simulate over those different meshes. I use the finest mesh simulation results as ground truth. I am wondering what is the standard why of evaluating convergence, should I evaluate it on coarse mesh or the finest mesh?

This might be of your interest Solving PDEs in Python - <br> The FEniCS Tutorial Volume I

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