Radio broadcasts to everyone.
Light you can block off to a single direction.
Oh wait, directional radio antennas exist. Nevermind, yes. Exactly like radio waves.
Sorta, kinda. You're really only just attenuating things a lot. It's tricky to actually block it off fully.
Same with radio waves, as light is literally the same phenomena as radio waves, it's just shaking faster.
Sorta, kinda. You're really only just attenuating things a lot. It's tricky to actually block it off fully.
Same with radio waves, as light is literally the same phenomena as radio waves, it's just shaking faster.