Ask HN: Why crossing light beams don't collide/decrease each other's brightness?

1 点作者 tarikozket将近 10 年前

Why light doesn't interact or interfere with another light? For instance: http://mrclarkrbhs.wikispaces.com/file/view/galarie_psl.jpg/339906824/440x277/galarie_psl.jpg

3 条评论

mysterymachine将近 10 年前

Light does experience interference, but in a wavelike manner, not a purely additive manner. Here's what wikipedia has to say.<p><a href="https://en.wikipedia.org/wiki/Interference_(wave_propagation)#Optical_interference" rel="nofollow">https://en.wikipedia.org/wiki/Interference_(wave_propagation...</a>

ctdonath将近 10 年前

Same reason a room doesn't get quieter when lots of people are talking.

philipov将近 10 年前

Because photons are massless and behave like waves.