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We were reading in class the book "Please Explain" by Isaac Asimov,
and answer 78 explains about light interference. It says that when
two white light waves interfere destructively on a screen, we can
obtain darkness in the screen, but energy should be converted to
another form: heat (screen temperature raises up) . A student asked
me about the case that white ligth interference were in perfect
vacuum, ¿ in wich way can the energy conservation principle be
preserved ? .¿ Energy will be manifested as heat ?.
That's easy. Asimov's answer is fiction. Not science
fiction, just fiction.