Which effect provides direct experimental evidence that light is a transverse, rather than a longitudinal wave motion?

Sound, a longitudinal wave, can be diffracted, can be made to interfere, whose intensity is inversely proportional to the square of distance from the source, but can not be polarised.

Light, a transverse wave, can be diffracted, can be made to interfere, whose intensity is inversely proportional to the square of distance from the source, can also be polarised.