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I explain that over time, we
correct our models until in the end there is one remaining model for the given phenomenon.
Slight nitpick: We are not necessarily restricted to "one" remaining
model. Commonly there are multiple models with overlapping coverage.
This is where the correspondence principle comes in.
Physical optics says that geometric optics is OK in certain limits.
Quantum mechanics says that classical mechanics is OK in certain limits.
Special relativity says that non-relativistic mechanics is OK in certain limits.
General relativity says that the flat-spacetime model is OK in certain limits.
You can do chemical reactions neglecting nuclear reactions in certain limits.
Et cetera. Other examples abound.