scientists since the discovery of these phenomena In this context, it is
interesting to note what Richard Feynman* has said in his famous
Feynman Lectures on Physics:
No one has ever been able to define the difference between
interference and diffraction satisfactorily It is just a question
of usage, and there is no specific, important physical difference
between them The best we can do is, roughly speaking, is to
say that when there are only a few sources, say two interfering
sources, then the result is usually called interference, but if there
is a large number of them, it seems that the word diffraction is
more often used