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

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

Wave Optics

Solution:

Sound, a longitudinal wave, can be diffracted, can be made to interfere, whose intensity falls off inversely as 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 falls of inversely as the square of distance from the source, can also be polarised.