Does light have mass or is light matter?
“My answer” is YES. Light does have effective mass and it does demonstrate inertia and gravitational participation. Each photon of light has an effective mass of m=h*f/c^2. Light DOES have momentum, and light IS affected by gravitational fields. I would argue that light is matter. Light photons AT REST aren’t matter and have zero rest mass…BUT, light DOESN’T EXIST as light at rest, because the photons are destroyed upon absorption. “how do you get energy to turn to matter?” “Converting energy into matter” and “converting matter into energy” is a BIG MISNOMER. Matter is not “converted into” energy, matter ALREADY WAS energy, and always will be matter once the process completes. Mass and energy are one unified entity. That is what the mass-energy equivalence principle states. Mass is simply evidence of energy.
