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by lutusp 4593 days ago
>> There was a debate about whether light was a wave or a particle -- evidence supported both views.

> Not before the 20th century,

Yes before the 20th century. I refer you to the debate between Newton and Huygens as well as Hooke, his contemporaries with respect to these ideas.

http://www.studyphysics.ca/newnotes/20/unit04_light/chp1719_...

Such debates persisted from then until the shaping of quantum theory.