How can you guarantee that there will be no physics discovered in the future that will resolve to our theoretical physics of today, while at the same time providing a greater depth of knowledge? You can't, no one can. Only mathematical proofs can be considered to be solved, or closed.


From a purely practical standpoint, there are a number of fields of study which by now contain very few unanswered questions and can be considered (again, for practical purposes) "solved". These include AC and DC circuit analysis (both lumped and distributed), continuum mechanics (elastic behavior of beams, columns, etc.), subsonic airflow around ...


Just rotate the quarter-waveplate to achieve maximum contrast. This way you ensure that whichever light falls onto your detection will extinguish to the unpolarized minimum. What you effectively do is make sure that after the quarter waveplate you always get linearly polarized light: in the case of linearly polarized light, this means aligning the quarter ...

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