Question

Which of the following was not considered to be strong evidence for the wave nature of light? refraction, diffraction, interference, or polarization.

Answers

refraction, diffraction, and interference can all be explained using Huygens' principle, see:
http://farside.ph.utexas.edu/teaching/302l/lectures/node150.html

Polarization on the other hand requires electromagnetic principles. (E cross H)

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