3 ms·
Ask HN: Why crossing light beams don't collide/decrease each other's brightness?
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
- philipov 11y agoBecause photons are massless and behave like waves.
- ctdonath 11y agoSame reason a room doesn't get quieter when lots of people are talking.
- mysterymachine 11y agoLight does experience interference, but in a wavelike manner, not a purely additive manner. Here's what wikipedia has to say. https://en.wikipedia.org/wiki/Interference_(wave_propagation)#Optical_interference https://en.wikipedia.org/wiki/Interference_(wave_propagation...