Is that really how physics works? Two equally dim LEDs being visible from further than one equally dim LED? This would be news to me if their distance adds somehow.
Well that may not be a fact,
Will it reach a receiver at twice the distance with the same level of light?
YES IT IS. Having a higher intensity of light will not go further than the lowest intensity of light you can get which is a photon. There is no limit on how far a photon can travel if it is not blocked. But the brighter the light the more photons arrive at given distance and so the easier it is to detect. Light doesn't just go so far and then stop.
You should have read the rest of the post.
The light direction has to be taken into account, as well as the phase if they are of the same exact wavelength.
I gave a simple example where the two light sources were facing away from each other, there's no way their light can add.
and for our purposes they may add, but these two can NOT add:<--- ~~~~~~( )~~~~~~ --->because they are facing entirely different directions.
This means sometimes we say "the light goes farther"
I am glad I never taught you physics, you would have failed.
What about a LED on a meter thick concrete?
There is no limit on how far a photon can travel if it is not blocked.
I am glad you never taught me physics and poor children if you teach any.
Oh dear we are at it again MrAL are we. You have a track record of not understanding things, but thinking you do.I did, painful as it was. I am glad I never taught you physics, you would have failed.No. The phase is only important if the light sources are coherent, in an LED they are not. And the direction is irrelevant. Just assume an isotropic radiator and an emission intensity adjusted to compensate.Yep and a pretty stupid example it was. You can not get any light source that does not have some radiation in some direction, only in your unrealistically simplistic world can this happen, in real life it does not. But there was no point in this example anyway it did not advance the argument. Basically it all comes down to the derivation of the inverse square law and the area on the sphere of radiation corresponding to the area of the sensing element receiving enough photons to get a sufficiently large signal to noise ratio to allow reliable detection. That would be true if there was such a thing as a light source that only radiated in one direction. They do not exist.Yes you say it, but it is total bollocks from a physics point of view, which is what was being expressed in the question I responded to, which was:- I hope you agree that the answer is yes they do add, and if you define "the light goes further" in a totally none physics way of meaning "the distance limit of sensing".