For active noise cancelling (in for example headphones) a process called 'destructive interference' is used.
Since Electromagnetic radiation can be described as a wave, could the same process (destructive interference) be used to 'cancel out' (or at least reduce the amplitude) of an electromagnetic radiation source?
If this is indeed possible, how would the waves (in case of EM radiation) 'cancel out' each other?
For active noise canceling the explanation given on wiki is "The waves combine to form a new wave, in a process called interference, and effectively cancel each other out" if I understand correctly the inverse sound wave compensates for the higher pressure 'compressed' zones caused by the 'ambient sound' by adding a 'low pressure' zone to decrease the pressure difference and visa versa thus dampening the sound. However I can't think of how this would work in case of EM radiation (in case it's possible).